A:AnswerIt probably wont be back in stock until the price of bitcoin goes back down again, or if another card with better performance for the same price (such as the rtx 3060) comes out.
A:AnswerAny CPU is theoretically compatible with any GPU, as long as they aren't decades apart in age and the hardware is compatible. Your best bet for the price is a recent i5/i7 or the best AMD Ryzen you can afford, depending on your MOBO.