Walmart offers the Blaupunkt Toronto In-Dash AM/FM Bluetooth Media Receiver for $8.50. Choose in-store pickup to dodge the $5.99 shipping fee. That's $8 off list and the best deal we've seen for any in-dash Bluetooth receiver. It features an LCD display, AUX and USB inputs, and a micro SD card slot.
If you have or expect to have a modest retirement income, you may want to avoid spending your golden years here.