I was at KB Toys in Arundel Mills MD recently and they were selling kits for 15$.
They came with 1 juicebox, 1 soft case, 1 set of headphones for kids, 3 random cartridges, and 1 MP3 kit(software, SD card reader, SD card adapter, and 32MB SD Card).
After picking up a couple to hack apart and a couple for the kids, we liked the MP3 component enough(and the idea of making picture frames) that we went back and cleaned out the store(16 juiceboxes) to give out as gifts(stash the cartridges and give them out as cheap MP3 players for the under 10 relatives and cheap electronic projects for the over 10 relatives).
The clerk at that KB mentioned that all the KB stores in the Marland area are trying to unload the juiceboxes, so if your local to MD check em out(and perhaps nationally, no idea there)