The Dreo Air Purifier 338 hits its Amazon all-time low of $60 and is 33% off. It carries AHAM Verified performance testing and ENERGY STAR certification. Three aroma pads are included for the built-in scent diffuser. Shipping is free. Buy Now at Amazon

At Amazon, this AlorAir HEPA air scrubber is $99 off and priced below its 90-day average of $462.  The package includes a 2-pack of MERV-10 filters when the unit and filter are both added to the cart. Auxiliary GFCI outlets on the panel let the unit power other tools. Shipping is free. Buy Now at Amazon

This two-pack of Blueair Blue Signature Mini air purifiers is $20 off the regular $99.99 price at Costco. Each unit covers up to 610 sq. ft. and uses 4-stage HEPASilent filtration that removes 99.97% of airborne particles down to 0.1 microns, with operation as quiet as 20 decibels. This deal ends November 15. Buy Now at Costco

This 16-in-1 air quality monitor is $23 off, dropping to $77 from its regular $100 price at Amazon. It's the best price Amazon has charged for this model. It tracks CO2, PM2.5, PM10, HCHO, TVOC, temperature, and humidity on a single 7" display, with a built-in buzzer that alerts you when readings exceed set thresholds. Buy Now at Amazon

Update: The price has dropped to $59.99 since this was originally published.

At Amazon, get this Lecoolife 10-in-1 Indoor Air Quality Monitor for $66. It's the best price Amazon has charged for this model. It tracks ten indoor readings at once, including PM1.0, PM2.5, PM10, HCHO, and TVOC levels, along with temperature and humidity, displayed on a large color screen with real-time AQI alerts. Buy Now at Amazon

Update: The price has changed to $49.99 since this was originally published.

Good for bedrooms or small home offices where you want cleaner air without a bulky unit taking up space, and at $48, it's $12 off the usual $60 price. Buy Now at Amazon

Update: The price has changed to $49.99 since this was originally published.

Good for bedrooms or small home offices where you want cleaner air without a bulky unit taking up space, and at $48, it's $12 off the usual $60 price. Buy Now at Amazon

Dealing with pet odors, cooking smells, or stuffy rooms calls for something that tackles multiple issues at once, and this unit's 4-in-1 filtration handles dust, allergens, and odors without needing separate devices for each. Buy Now at Amazon

Worth stocking up on if your HVAC system takes this oversized filter size, since it's not as common as standard dimensions and can be harder to find in stores. MERV 8 handles everyday dust and pollen without restricting airflow the way higher-rated filters can. Buy Now at Home Depot

This 2-pack covers an odd-sized vent that standard filter aisles don't always stock, so it's worth grabbing if your HVAC system calls for a 6" x 12" x 1" size. MERV 8 handles everyday dust and pollen without restricting airflow the way higher-rated filters can. Buy Now at Home Depot

Your HVAC system eats up this odd 12" x 26" x 4" size, so this 3-pack from Home Depot is worth grabbing if you've struggled to find it elsewhere, and the MERV 11 rating catches dust and pollen without choking off airflow the way denser filters can. Buy Now at Home Depot

Anyone dealing with seasonal allergies or pet dander will want the MERV 11 rating here, since it captures smaller particles than basic filters without the airflow restriction of higher-MERV options. The 4" depth also means fewer filter changes than a standard 1" model, which suits households that forget about maintenance schedules. Buy Now at Home Depot

Swapping filters every 90 days gets easier when you've got a 2-pack on hand, and the MERV 11 rating catches dust, pollen, and pet dander without choking airflow the way higher ratings can. Good fit for allergy-prone households that still want decent furnace or AC efficiency. Buy Now at Home Depot

Swap this in if you want a middle-ground filter that catches more allergens and dust than a basic MERV 8 without choking airflow like the higher-MERV options can, and the 4-pack means you're set for a year without reordering. Buy Now at Home Depot

This odd-size filter is worth checking against your unit's actual dimensions before you buy, since 16.25" x 21" isn't a standard cut and can be tough to find locally. MERV 8 handles everyday dust and pollen without restricting airflow, making it a reasonable pick for routine home filtration rather than allergy-heavy needs. Buy Now at Home Depot

Update: The price has changed to $3.10 since this was originally published.

Cutting a sheet of this to wrap around your furnace or HVAC filter extends the life of the filter underneath by catching larger debris first, which is handy if you want to stretch time between replacements. At $3.09, that's over half off the $6.66 list price. Buy Now at Amazon

Handy for allergy sufferers or anyone wanting cleaner air in a bedroom or home office without constant filter guesswork, since it tracks air quality in real time. Amazon has it for $88, which is $42 off the $130 list price. Buy Now at Amazon

Keeps your GermGuardian unit filtering allergens at full strength without the wait or markup of buying filters one at a time, and this 4-pack runs $10 (50%) off the $20 list price. Buy Now at Amazon

Dust, pet dander, and allergens in a small room are what this one's built to handle, and it's a budget-friendly pick for a bedroom or home office at $23.36, which is $2.60 off the list price. Buy Now at Amazon

Your HVAC system needs a filter change every 60-90 days anyway, so grabbing this 4-pack covers you for the better part of a year while catching the finer particles a basic filter lets through. Good fit for households dealing with pet dander or seasonal allergies who want better filtration without stepping up to a HEPA-level price tag. Buy Now at Home Depot