Walmart offers the XO Vision Automotive Digital Media Receiver, model no. XD103, for $19.88. Choose in-store pickup to dodge the $4.97 shipping fee. That's the lowest price we could find by $2, although we saw it for $4 less last February. This MP3 stereo receiver features 80 watts of maximum power, a USB port, SD card slot, FM tuner with 18 presets, and auxiliary port.