Walmart offers the Repel Lemon Eucalyptus Natural Insect Repellent 4-oz. Pump Spray for $3.57. (Target and Home Depot charge a few cents more.) Opt for in-store pickup to dodge the $5.99 shipping fee. That's tied with our mention from two weeks ago as the lowest price we've seen and the best deal today by a buck. It's DEET-free and purportedly repels mosquitoes and deer ticks for up to six hours.

Note: With orders of $25 or more, Amazon charges $3.57 with free shipping. (This item is part of Amazon's "add-on" program and can only be purchased with orders of $25 or more.)