I was in a Reject Shop today when i saw that they had an iPhone Induction Charger for the 3G and 3GS models for only $10. This was in a catalogue a couple of months ago for $60, so they must be clearing them out.
How it works is that you put a supplied case on your phone and just lay the phone on the supplied pad, and shazam the phone charges. The pad can charge two iPhones at one time (but i guess you'd have to buy two kits to get the two cases - then you could charge 4 phones at once, but then you'd need 4 kits, but then you can charge 8 phones - i could go on forever!)
I have seen these in a few of the Reject Shops, and they have national pricing, so you should be able to get these at most shops who still have them.
Amazing the amount of effort that some people will expend just so that they don't have to plug that little white wire into the bottom of the phone, eh?
But it's a great deal anyway, if the product actually works.