Walgreens: Great Deal on Velveeta Shells & Cheese

I haven't tried this Walgreens deal yet myself, but Moms By Heart had the following deal on her blog:

Velveeta Shells & Cheese Cups
$1.00 - Buy four!
- Buy One, Get One FREE (Printable Coupon Here)
- $1.50 (Register Rewards when you buy four)
= $ .50 for 4 after coupons and Register Rewards!