The only thing I've personally seen stitch go for is other super rares... Minnie or baseball cap, specifically. Or I guess a bulk amount of the "typical" trading furniture (clocks/walls/whatever else)
Which is dang near impossible to get when you start from scratch, but as they said, credits are a major trading item. Especially now with the gift cards. People will want sprees each month/week/day, too, for new items, so be on the lookout for that.