I recently paid $120 for 4x8gb 3000 DDR4 RGB DIMMs used on eBay so prices aren’t totally insane just yet. Anything new is out of stock or close to it because DDR5 is/was the norm. It would probably be cheaper to buy server ram if you can get a board and CPU that can use it.
https://pcpartpicker.com/trends/price/memory/
This has new 2x8GB 3200 DDR4 DIMMs being a bit over $200 at the moment.
A year back, it was $50, but not now.
I recently paid $120 for 4x8gb 3000 DDR4 RGB DIMMs used on eBay so prices aren’t totally insane just yet. Anything new is out of stock or close to it because DDR5 is/was the norm. It would probably be cheaper to buy server ram if you can get a board and CPU that can use it.