I have 2 of these. Affordable great sound and small. FM tuner and Bluetooth along with multiple aux inputs. The pic has this unit. My 1980s inspired boom box.

www.ebay.com/itm/Pyle-PDA6BU-Bluetooth-Stereo-Amplifier-Receiver-FM-Radio-USB-SD-memory/262805596324?hash=item3d306f28a4:g:U~kAAOSwImRYh6iw


I have one of these as well. Not as powerful as the above but sounds great and goes pretty loud. No FM tuner but Bluetooth and 2 aux inputs.

https://www.ebay.com/itm/Pyle-PCAU48BT-2-x-120W-Bluetooth-Stereo-Power-Amplifier-USB-SD-AUX-Remote/262863896873?epid=1433721870&hash=item3d33e8c129:g:VIoAAOSwxLdb6ybj