Keep your eyes peeled for coupons for FREE gift cards when you transfer a prescription.
Walgreens, CVS, Target, and Rite-Aid all put out these glorious coupons from time to time. If you need to fill/refill a prescription anyway, why not get paid to do so? I love having these gift cards on hand to reduce my out-of-pocket expenses, and the prescription is tax-deductible.
Brookshire's also honors these competitor offers, and that has bought me many groceries.
If you're really lucky, you might come across one for a NEW prescription, but that's a little rare.