iPhones ship with a USB Power Adapter that transforms the included sync cable into a wall charger.  And, if you want to keep more than one power adapter around (one for the bedroom, another for the office, etc.), Apple will happily sell you additional adapters at $29 a pop. 

But dropping $30 on a charger is highway robbery; we have a much better solution.

eBay is filled with auctions – and BuyItNow sales – for iPhone Wall Chargers for much, much less: $2 -$4.  True, they’re not as cute and cuddly as the tiny Apple USB Power Adapter, but if you’re willing to spend a bit more, say $4-$6, you can nab an OEM version of the USB Power Adapter and never know the difference.  It might not hurt to pick up some additional cables as well.

As always, we recommend looking for new, unopened products on eBay.  And check out seller ratings to be sure you’re buying from someone with a great track record.