XO Vision XD103 car stereo receiver w/ SD & USB $19 @ Walmart
Walmart just dropped the price on this from $25 to $19, and you can get 97 cent shipping. It doesn't seem to be an official sale of any sort, but I've read that they intermittently drop the price on it. It was last listed here in May, from MWave, but their price is now $26.99.
I'm sure it's not of the highest quality, but if you just need to replace a broken radio in an old vehicle like me, it's an unbeatable deal.
From the description:
XO Vision XD103 FM and MP3 Stereo Receiver with USB Port and SD Card Slot:The reviews on Amazon are generally positive [amazon.com]
Audio output 20 x 4W maximum
MP3 playback via USB port or SD card slot
Digital FM tuner with 18 presets
AUX-in on front panel
Half-size DIN depth
4-channel audio output
Electronic audio controls