I was shopping at Circuit City, just browsing for cheap stuff I could use and came across this. It was in 2 places at the store, one was marked $4.95 and one $2.99. It rang up $2.99 and apparently it's online as well. I picked up a white one, there was a camouflage one and a turquoise one left at the Circuit City near the University in Charlotte. It's also online, but I don't think you can choose the color. http://www.circuitcity.com/ssm/Intec-Nintendo-DS-Lite-Leather-Case-G1847/sem/rpsm/oid/164596/rpem/ccd/productDetail.do
Or search for Intec Leather DS.
Or search for Intec Leather DS.