Try this if you can find one for cheap:
http://www.amazon.com/Cover-Custom-L.../dp/B001DESZWW
It's an incredible light for reading books on the PRS-505. I had one myself, and I haven't had a light for reading that good since I sold the 505 to get the T1. If anyone could confirm that it fits the T1 perfectly, I'd get one in a heartbeat for the T1.