Here's a small shout-out for our American iPad-owning but not iCade-owning audience: Bed Bath & Beyond, which seems like a strange place to buy an iCade to begin with, is apparently liquidating their inventory at $49.99 a pop. You can head on over to their site and order one, or check to see if any stores have them in stock locally. In the Chicago area, it seems like almost every nearby location has them, but your milage will vary.
We've already extensively reviewed the iCade in the past, and maintain a pretty awesome list of iCade-supported games to check out as well. If you were lucky enough to snag iMAME before it disappeared, consider that iMAME comes with full iCade support, making it pretty awesome. (Alternatively, you could always jailbreak and install imame4all if you missed iMAME.)
It doesn't seem like Bed Bath & Beyond ships outside of the USA, so our friends from abroad lose out on this deal. You likely have universal healthcare though, so I'd still argue you're winning overall even without $50 iCades.