As I mentioned, I bought the frames for my glasses at Costco. I used my reward/rebate check to pay for them. My check was for $97 and the glasses cost $50 plus tax. I got the difference in cash. When I continued shopping (for food) and checked out, I used my American Express and not the remaining cash. My American Express gives me 1% back. No sense losing out on that. In fact, the best way to use your reward check is to buy something small and get the remainder in cash.
I wouldn’t go out of my way to do this. But, I will remember that my reward check comes right around the time I’m eligible for glasses.
My new specs look great, BTW!