get a membership card designed that you could swipe like any credit/debit card or have a barcode you could scan , if your not using high end technology like that then the way your thinking would be the way to go
Actively taking Consignments, PM for details.
Limited Time High End NBA Break: http://tinyurl.com/mbs5d2b
Upcoming Breaks: Treasure Hunt #6, Some Football Buffet
Collection Focus: Victor Cruz /25 or less, no plates or sticker autos. Also any cards #d 80/xxx