FF cameras are already very close to the price levels of aps-c cameras, though it may not match feature to feature.
Usually the lower end FF is close to the price of the highest end APSC.
If you don't need any bells and whistles, the used Canon 5D is a steal and a very relevant/good camera imo. (I had one)
Max ISO3200, but its a ISO3200 that 'works'
An A7II is about USD1100 here.
The older A7 is probably cheaper.
IMO, camera companies are killing themselves with a yearly product cycle and FF priced too cheaply.
Its not sustainable in the long run, since the running/rnd costs can't keep up to this sort of short cycle.
Sony clearly knows this and wants to get ahead and they have an advantage as their MILC are simpler to make (basically a PCBA with 2 LCDs)