which memory card should i get?

it doesn't seem to work, i want to get another mem card (not a 4in1 or whatever in 1, i want to be able to save directly)

what memory card (type and manufacturor) should i get?
i cant seem to find one on ebay
I`ve used the Interact for years without problems (except the damn plastic is cheap and falls apart). I was surprised when I accidentally discovered that it can also be used to play import games. Got mine at Toys R Us a few years ago for like 5 bucks
thanks for the help guys, i went to the NCSXHFBV blah blah site and got the right syntax (ie. Power Memory Card), then i used that systax to do a search on eBay and i won an official sega saturn mem card for 20 bux