I looked into it several years ago. I bought an old G-1 kit back when they were $100 each and bought a bunch of FAL magazines for $4-7 each. I ended up getting into AR's instead. I may still build one once my kids are out of the house. Unfortunately, the golden days of the cheap FAL are behind...
A like-new Norinco 1911 for $200 back in 1993. I think they were going for about $300 new back then. I still have it.
I paid about $200 for a pristine 1972 Marlin 336C in 30-30.