tools to make board r expensive even if u design board urself n get printed somewhere 

 https://github.com/skot/bitaxeGamma 

 I think most use services like PCBway, or anywhere you can upload the board designs that are on the Skot github repository. 
So yes since it's open source, it is possible to assemble one yourself with of the shelf parts. Last I looked the hardest part to source was the ASIC chip.