$.50 for a 4pack of Coke after ECB's at CVS

Coupons.com has a RiteAid coupon for $2.00 off 12 pack of coke products. This week CVS has coke products on sale for 4/$13. You get back $3 ECB's when you buy 4. Use 4 coupons (you'll need 2 computers for this). You'll pay $5.00 + tax. After the ecb's you get pack, it's like paying $.50 a pack.