The current price at which you can purchase a GPU may vary substantially based on location, so there is no certain answer.

Please try the following: 
1) Determine which available GPUs fulfill your minimum needs based on benchmark details; 
2) Gather their prices from trusted local vendors; 
3) Calculate the price/performance ratio and select the best one.

Additionally, you could consider purchasing a GPU in the second-hand market at a discount.
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