CVS has Sally Hansen Xtreme Nail Color for $3.39
You will get a $5 Extra Bucks reward when you buy any 2 Sally Hansen cosmetics. You can get up to 3 rewards, or 6 items.
Get a $3 off $15 CVS store coupon for cosmetics from the coupon kiosk or in-app.
Buy 6 Sally Hansen nail color @ $3.39
Use $3 off $15 store coupon
Pay $17.34 at the register
Get $15 in Extra Bucks rewards
Net cost: $2.34 for 6 or just 39 cents each