Walmart offers the Dual Electronics Double-DIN Bluetooth Car Stereo Multimedia Receiver for $29.99. Choose in-store pickup to avoid the $5.99 shipping fee. That's tied with last month's mention and the lowest price we could find by $16. It features CD, USB, MP3, WMA playback. Note: You can also get free shipping with orders of $35 or more.
There are plenty of great ways to spend your money, but you can safely leave these products on the store shelf.