These days we'd be lucky to see certain models discounted to $314.
For reference, the cheapest 16GB LPDDR4 (not 4X as used in the Pi 5) DIMM in stock is more than $150, which is about what I paid for the 64GB of DDR4 in my desktop a couple years ago.
The price of a pico is what the zero used to be, and the 4gb/8gb 5 is $110 to $185 depending on ram when the 4 used to be I think $55 to $75 at the same ram.
I shouldn't be surprised because it's similar to/worse than the transition from DDR3 to DDR4, but I still was caught off guard to some degree.
Fortunately for me, I already have a stack of criminally underutilized Pi 3, 4, and 5 units on a shelf from a past (non-hobby) project. No 16GB, but multiple 8GB units, and 8GB is enough for most anything I can imagine wanting to do on a Pi.