Asus Transformer TF101 - What's it worth?

Couple years ago I bought a 1st gen Asus transformer TF101 tablet with detachable keyboard included ($100 off, open box special). It's been great but I no longer use it much anymore and I'm thinking of selling it.

It's still in like-new condition. No scratches and the screen is perfect. Both batteries in the tablet and keyboard dock still hold a charge for a very long time. Thing runs for days on end! The only thing I'd have to do is re-install the stock Asus ICS ROM and wipe all my data (no biggy).

What do you guys think this is worth? I haven't seen many for sale which is why I'm asking.