Because of a new type of "Crypto Currency" coming out (Like a new version of Bitcoin, Dogecoin, etc) people are buying graphics cards by the dozens to use the to farm for this new currency.
Because of the sudden, insane, demand of graphics cards, the prices of almost ALL mid/high-end GPUs have skyrocketed as you see.
The only way around this right now is to search locally for someone selling a decent GPU, who is clueless as to the current demand for them, However this can be extremely difficult and time consuming. I recommend you set tight and wait for the market prices to subside in a few months and make due with what you have right now.
I know, its super inconvenient.
Hope this helps, good luck.