If you are interested, EB Games carries a sort of deal with the NGPC -- 1, fully-working NGPC, 6 fully-working NGPC games (KOF R-2, Metal Slug 1st Mission, Neo Turf Masters, Samurai Shodown! 2, Fatal Fury: First Contact and Pacman), 2 AA batteries and a CR2032 lithium battery all for $79.99 including shipping.
Gamestop -- if you order online -- will do the same, for $69.99 shipping, instead.
It's a great deal, and I'm happy with what I got, even though I'd really like having the original NGPC packaging and manual. If you're interested only in the system (and the games), you can't really go wrong. Otherwise, you're better off either hunting on eBay (risky) or waiting here for an answer (pretty safe). Most people here seem trustworthy enough!
Hope I was helpful (and not too redundant). And let me know how you enjoy your NGPC. I'm playing mine as I type this. :9