I was in the same boat. I am using Focals in one of my cars. They were $600. I found them overseas for $300. They sound amazing. If you put good speakers in your car, you won't even be bothered about how much you spent. If you put cheap ones that distort, you'll be regretting the purchase the entire time and eventually have to rip them out and start over and buy the more expensive ones the next time around. Why not just skip that 1st process and go straight to the good speakers and be done with it?
I no longer look for cheap stuff. Just show me the best. If I can't afford it, I will just wait up longer to save more money. Not a big deal. If you can make $200, you can make $400. If you make $400, you can make $800. It's only money. You can always make more!! You just have to learn patience.