i would imagine that any of the usb adapters would work just fine--as long as it just needs usb. if the adapter that delorme is selling has something non-standard, which i doubt it does, then you'd need it instead. it's not uncommon for usb to power devices and it sounds to me like it's just simple, basic usb with no extra bells, they just want to make some money. however, 10-15$ sounds like it might be a little <i>too</i> cheap... but who knows? i'd recommend looking for reviews on the cheap stuff before you buy it.