Scotts GrubEx1 Season Long Grub Killer, 5,000 sq. ft. — $18.97

Scotts GrubEx1 is a granular lawn insecticide that kills grubs before they chew up your turf, with one application covering 5,000 sq. ft. and working for up to four months. Amazon has the bag at $18.97, down from a $31.99 list price (41% off), which works out to about 8 cents an ounce.

This is worth grabbing if you've spotted brown patches, June beetles, or armyworm damage and want to treat now before grubs mature. Keep in mind it's a once-a-year product — you can't reapply mid-season — and larger sizes (10,000 sq. ft. or multi-packs) are available at similar per-ounce pricing if your yard is bigger than the base bag covers.