You really may be waiting a good while. And if a desirable used model is ever a decent price, it’ll be a unit burnt out from mining fake money that’s only used to buy real money or a mail order of LSD.
It's very possible that an undervolted, well-ventilated card, run with a steady workload 24/7/365 for three years would have _less_ wear and tear than a card used for gaming and then shut down every night for three years.