I use a Coach ID card case. Have had it for a couple years and its holding up well. It was $20 bucks or so at a Coach outlet store.
http://www.coach.com/online/handbags/Product-bleecker_id_card_case_in_signature_coated_canvas-10551-10051-74585-en?cs=mabr&catId=5000000000000334801
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http://www.coach.com/online/handbags/Product-bleecker_id_card_case_in_signature_coated_canvas-10551-10051-74585-en?cs=mabr&catId=5000000000000334801
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