Getting More for Less - Part Three

Here's an example of one of my recent Walgreens trips:

I already had a $3.50 register reward.

Walgreens was offering Witch Hazel for $4.00 with a $4.00 reward.

I used my $3.50 reward on this purchase, so I paid 50 cents, and got a $4.00 reward back.  (MONEY MAKER!)

I bought some anti-itch cream marked at $5.00 with a $5.00 reward back. 
I used the $4.00 reward, so I paid $1.00, and got a $5.00 reward back.  (MONEY MAKER!)

I bought some contact lens solution marked at $7.99 with an $8.00 reward.  I used the $5.00 reward, so I paid $2.99, and received $8.00 back.  (MONEY MAKER!)

(Come back on Thursday to read Part Four!)