For the most part, there has been a correlation between GPU street pricing trends as they relate to MSRP, and the cryptocurrency market. That doesn't mean crypto is the sole cause of rising and falling GPUs prices, but most would agree it is playing a role to some extent.
In any event, the folks at 3DCenter have continually monitored GPU street price trends based on the average cost at “major German retailers,” and plots it out each month. Here's the latest iteration of that ongoing graph…
There's a trickle down effect at play, too. With crypto mining taking a nose dive, miners have begun flooding the market with used GPUs. This has increased availability, which in turn has helped push prices down.