Device that plays the USB you made for your car in your home

Cheap PC with the free VLC media player? Or even a phone with a micro USB to USB adapter.

You've always got the option of getting a Raspberry Pi and running the Picoreplayer OS on it. You can plug in a USB thumb drive (or regular USB hard drive) and play music from that, including on a random basis. 

If your home system handles USB output, this will set you back about $50 or $60 for the RPi, case, SD card and power supply. If you need analog output, add a HiFiBerry DAC Hat to the player for another $50, depending on the model you buy (they have several options.) Or, if you want to stay on the cheap side, you can use the built-in audio on the Raspberry Pi and run a 3.5 mm plug to RCA adaptor cable to your stereo, though the sound quality is not as good this way. 

The RPi player can be controlled from your smart phone, table or any computer that has a web browser. 

It's not a plug and play system, so you'll have to study and learn a few things, but the price is right and, properly set up, they sound good.

If you want plug and play you can get a BluSound N150. It’ll play any PCM file to 24-192.
It will power any thumb drive or a SSD up to 500 Gb.  Optical out, a cheap DAC and cheap amp included.

.$299

https://www.amazon.com/dp/B00J0C35BA/ref=cm_sw_r_cp_apa_fabc_QIR3Fb37YJK9M

guys, the OP is asking for something that "would output on analog rca connections". This was the main reason I had to recommend something as expensive as the $399 Panasonic bluray.

If he has the ability to take a USB or digital COAX signal, then the lower end Sony bluray players will do this just fine (probably around $100 or less).

@auxinput, the Raspberry Pi I described will output an analog signal to RCA jacks -- even gave him two options depending on his sound quality demands, for a cost range of $50 to $100 or so.