Wow! Coupons.com (zip 90210) has just added a coupon good for $2 off any Rimmel product! You can find the eye shadow singles or Extra Super Lash mascara for $2.24 at Walmart or Target, so just $.24 after coupon! There have also been some clearance deals at CVS and Target so possible freebies!
NOTE: this is a manufacturer's coupon, so you can use it at any store. It does have a notation under the item description that says "Available at Walmart".