I couldn't quickly find my renewal receipt in my checking account, so I upgraded to DFWMAS Premium membership twice one year so I could take a receipt showing membership (still $25 annual) to get 10% DFWMAS discount at Dallas North Aquarium when we were changing our aquascape and needed a lot of dry rock.
I'm one of a small group that the digital wallet doesn't work, so now I keep my annual receipt in the car, that way I can find my receipt to show and get a discount when I need it