Walmart offers the XO Vision Automotive Digital Media Receiver, model no. XD103, for $15.88. Choose Site-to-Store pickup to dodge the $4.97 shipping fee. (Amazon charges the same price via Prime.) That's $8 under our shipped mention from two weeks ago and the best price we've seen. (It's currently $14 under the lowest shipped price we could find.) This MP3 stereo receiver features 80 watts of maximum power, a USB port, SD card slot, FM tuner with 18 presets, and auxiliary port.