B70 no stock/Price Increase

I bought a B70 off Amazon last week for 1300 and have been playing around with it. Today I checked and it seems like I cannot find a single one online for less than 1600 and most places dont have them in stock anymore? What happened? What drives these sudden price increases? It seems like all GPUs across the board have seen another dramatic price flux. Some 5090s I saw were going for 10k!?