I'm saying you can build yourself a nice set up by buying an amplifier off craigslist or something, buying vehicle speakers, and building the enclosures yourself.
Usually wiring the speakers to an 8 ohm load allows you to run vehicle speakers off of a house amp. If you manage to get deals on all your parts you can be looking at a pretty serious set up for 200 bucks.
My audiophile tendencies cover amps, dacs and headphones, not speakers tbh. I can get around with the high end stuff, never bothered to inquire about lower end stuff. I recommend you just do whatever @iverson954360 says.