Although prices have escalated in the last few years, my Russian commercial Makarov was under a hundred bucks and is absolutely reliable.

SKS rifles have also shot up from the halcyon days of $99.99, but I recently bought a Tula 1951 and 1200 rounds of ammunition for $350. Always goes bang.

I have a Kel Tec P3AT, a PF9, and a Sub 2000 that were all under $300 and have been reliable.