At Amazon, get the Irwin Tools Marathon Carbide 6.5" 18T Cordless Circular Saw Blade for $9. It's the best price we could find by $11. It is a 6.5" blade with 18 carbide teeth, sold with a limited lifetime warranty. Shipping is free for Prime members. Buy Now at Amazon

This Irwin circular saw blade is $8.91, down from $29.81. It's also below Amazon's recent average price of $16.63. The blade features 18 carbide teeth, a reinforced shoulder, and a fully hardened plate designed to stay true over time. Buy Now at Amazon

At Home Depot, buy the Milwaukee Sawzall 10-Piece Reciprocating Saw Blade Set for $19.97 and get a Milwaukee 5-Piece Saw Blade Set of your choice for free.  Three options are available, and you'd pay $20 for the 10-piece set alone elsewhere, saving you $14 to $21 on the free set.  Shipping is free. Buy Now at Home Depot

At Home Depot, this Milwaukee SAWZALL blade set is $19.97, down from $58 and the lowest price we could find. It's a 19-piece bi-metal set that cuts wood, metal, and multi-material and comes with a storage case. Free shipping applies.  Buy Now at Home Depot

Update: The price has dropped to $6.51 since this was originally published.

Anyone running an LEM electric meat saw through regular processing will need a spare blade like this on hand, and at $7.09 it's $10.90 below the $17.99 list price. Buy Now at Amazon

Anyone running a small electric chainsaw or pole saw needs spare chains on hand, and this 12-inch 45-link replacement keeps your tool cutting cleanly once the factory chain dulls out. Buy Now at Amazon

Spare blades are worth keeping on hand since they dull or snap right when you're mid-project, and a 5-pack means you're covered for metal, PVC, or wood cuts without a trip back to Home Depot. Buy Now at Home Depot

Anyone who already owns a Corona pruning saw will want to keep one of these on hand, since a sharp blade makes faster, cleaner cuts than trying to push through branches with a dull one. It's currently $6.29 off the list price. Buy Now at Amazon

Stocked with blades for wood, metal, and plastic, this kit suits anyone who uses an oscillating tool often enough to burn through accessories and would rather not keep buying them one at a time. Buy Now at Amazon

Anyone running a portable band saw for metal cutting will want extras like this on hand, since blades dull faster than most people expect and a 5-pack keeps you from stalling a job mid-cut. The 18 TPI count suits thinner stock and tighter work, making it a solid match for electricians, plumbers, or HVAC techs doing fieldwork. Buy Now at Home Depot

Your best bet if you're cutting concrete, brick, or block on a regular basis, since the segmented rim clears debris and stays cooler on tougher, abrasive materials than a standard blade. Buy Now at Home Depot

Carbide teeth hold an edge far longer than standard bi-metal blades, so this is a solid pick if you're cutting through nail-embedded wood or demo material on a regular basis. The 5-pack means you've got spares on hand for bigger jobs without a mid-project store run. Buy Now at Home Depot

Anyone repairing cracks in driveways or concrete slabs will want this for routing out a clean, consistent groove before sealing, since the diamond edge is built to follow existing cracks in both concrete and asphalt. Buy Now at Home Depot

Home Depot's 5-3/8-Inch 16-Tooth blade suits anyone running a compact or trim circular saw for framing work, where the lower tooth count is built for fast rip cuts through dimensional lumber rather than fine finish work. Buy Now at Home Depot

Anyone cutting tile or masonry regularly will appreciate the continuous rim design, which leaves a smoother edge than segmented blades and cuts down on chipping. Buy Now at Amazon

Update: The price has dropped to $38.00 since this was originally published.

Good fit for anyone cutting sheet metal or thin steel regularly, since the cermet-tipped teeth hold an edge far longer than standard metal-cutting blades and don't need constant replacing. Buy Now at Amazon

Worth having in your kit if you're cutting a lot of plywood or trim, since the 40-tooth count gives you a smoother finish than the standard 24-tooth framing blades most saws ship with. Buy Now at Home Depot

Anyone who cuts a lot of plywood or laminate flooring will appreciate having three blade options on hand instead of swapping a single blade mid-project, since each one is suited to a different material and cut quality. It's a practical pickup if you already own a track saw and want cleaner edges without constant blade changes. Buy Now at Home Depot

Worth stocking up on if you run an oscillating tool regularly for demo work, since carbide blades like this one hold up to nail-embedded wood and tough debris far longer than standard bi-metal blades. Buy Now at Home Depot

Anyone doing mixed-material cuts (wood with embedded nails, metal fasteners, and the like) will get more life out of the titanium coating than a standard bi-metal blade, since it resists heat buildup during longer cuts. The segmented edge also makes it easier to start precise plunge cuts in tight spots without wandering. Buy Now at Home Depot