Coupons.com has a great new $1 Sally Hansen printable coupon. Use that at Target and stack (stacking is when you use a store’s own coupon PLUS a manufacturer’s coupon on one item) that with the $1 Target coupon found here.
Sally Hansen items are usually priced quite low to begin with, so this deal should get you a nail product for under $1. Look for the Hard as Nails strengthener which is usually priced around $2.75.