I have a little tin can from the early days of the Vodafone CU package (Greece) that I throw all my SIMs in ;-)

got a plastic SD memory card case. its like a micro suitcase. all my 25 to 30 sim cards go in that.

I also store mine in the plastic boxes used for memory cards, (very handy) but have also ordered from ebay after seeing your link, thanks:idea:

thanks for the link, my sim case holder is being shipped whilst I write..;)