if you thinking about FP64 maybe you should check out used 7870 they have 0,7 tflops in fp64 and 3tflops in fp32, you can get them for around 100$ or if you want also better performance in fp32 you can check R9 290X they have 5,6tflops in fp32 and 0,7tflops in fp64 for about 150-200$.
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They are cheaper to buy, but are used and without warranty. The overall efficiency (FP64/kWh) is equal or less than on current RX Vega 56, and much less on FP32, so that's not an real option.