I just came from my local Wal Mart and I got the Crayola Light-Up Tracing Pad for $10.00 in the Xmas Toy Clearance. Its the super slim design and is blue and silver. It takes 3 AA batteries.
It works great, and is nice and slim will fit almost anywhere. Great buy, if you do applique this is alot better than trying to hold it all against a window pane, which is how I did my applique before.