I bought a Cyberhome DVD player case for my T250 from Radio Shack. This soft case has reinforcing so excellent you must see it to believe it.
http://www.radioshack.com/product.asp?catalog_name=CTLG&product;_id=16-3640
Because of the protruding battery the T250, although it will fit, was a bit too snug for my taste. I cut out a piece of the reinforcing to allow the T250 to fit like a proverbial glove. Slip cases just don’t do it for me because I must have a shoulder strap, and the case allows the AC adapter brick and a small BT mouse inside along with the T250. I will post additional picks when I am done with my personal modifications, but for now there is one pic here:
http://homepage.mac.com/bhardy3/PhotoAlbum38.html
Best thing about it is you can walk into any Radio Shack with your T150/250 to try the fit if they have the case in stock.