if you don't care about power ratings and just want bluetooth/usb, Amazon has a Boss radio they sell for $22 with instant coupon Partner this with a $4 wiring kit and you have bluetooth/usb jams for under $30.

Im sure I will get some audio guys downvoting me for recommending an off brand radio, but after using some of Boss' stuff, I can say its hand on heart a decent alternative to the big guys, they sound pretty good and the cost is really low.

Boss even has a couple of decent double din touch screens for under $100, or if you want to go super cheap, Amazon Prime days has a few of the off brand Chinese double dins for under $50 that get extremely good reviews, and typically have the benefit of being able to mirror your smart phone screen and/or play movies. I currently have this guy in my Honda Civic, and it powers the factory speakers better than the original radio, plus it supports Apple Car play, which $160 is a killer deal to be able to modernize any older car with this feature.