I always hear different things, but can I use my RR from Walgreens towards the purchase of something else that will spit out a RR? I bought the special k protein shakes today, and got my $5 RR. I want more, but also want other stuff too, and some of the other stuff is also supposed to generate RR. So I didn't know if for example, I bought 2 more protein shakes, some shampoo etc......I could use the $5 RR and expect to have more spit out.