I was wondering if any one could tell me if there is any major risk in buying a used memory card. I have an Olympus P&S which uses smart media cards. These cards are not made any longer, but I'd like to get a 128MB. I can't afford the prices being asked on e-bay for new 128MB cards and was thinking of buying used since there are plenty being offered. Anyone have any thoughts, advice, or experience with this?