Before covid and before crypto went boom you could of bought the RX470/480/570/580 for around $100-125 all day long. Actually sellers were desperate to get rid of those GPUs. Most gamers only wanted Nvidia.
Will it be $100 soon? Probably not because there is a massive GPU shortage, even if it’s not profitable to mine most likely the gamers will scoop them up and keep prices high. So who knows when they will actually be cheap again.
Gamers don't buy GPUs much compare to miners, every gamers only need one or two GPU for gaming and that's all, a miner can have up to 4-6 minimum GPUs for mining in their room, if mining isn't profitable anymore gamers can't keep the price up, let's wait and see