Well, you can search for parts at distributors such as DigiKey:
https://www.digikey.com/en/products/filter/embedded-fpgas-field-programmable-gate-array/696?s=N4IgTCBcDaIIYBsAuBTATnEBdANCArFKAA5Rh7GmRj4C%2BeAbESAJYAmUIAtAIwAMPEBSSchIJAE9iKTmwDOAYzEBHSaNq0gA
For FPGAs you can get parts from $5 up to $3000 or more, depending on the complexity of the device.
Probably going to be more expensive than a microcontroller which you can get from $1 to $20 or so per chip.
But it all depends on what you want to do.
The microcontroller is good for algorithms that are inherently sequential with limited parallelism.
The FPGA is good for massive parallel data operations.
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