If you're looking for a cheap tablet experience, then look no further - as long as you're a fan of Archos on Facebook, then you can grab the Archos 70 for 0, and it even includes a free case. Sure, it may not be the hottest thing in the tablet world right now, but for less than you would normally pay for some eBook readers, it's still hard to beat this deal.
The Archos 70 sports a 7 inch 800x480 display, 1GHz processor, 256MB RAM, 8GB of storage, and Android 2.2, so it's not the most amazing device you'll ever buy - but I bet it would be an awesome device to have around for hacking and ROMming purposes.