There sure is a corner market but builder's tend to get greedy and hustle the uninformed that don't realize how cheap a laser diode or phaser build in general can be. There is some fab time though but by the time your on your 2nd build you have an idea or two and can learn from mistakes.
You don't see them post sales here for that reason other than Jayrob who puts it all on the line as to what he doe's and basicly charges half of what others do that just throw in a diode and run with it.
Oh yes this topic is getting old "not this thread" and has bean mentioned plenty but I just remembered seeing a sale thread from around 2012 when someone was selling a AA phaser and mentioned he was the only one who found this "secret" to have the laser flashing to the sound setting. All he did was splice into the original LED wiring that did just that.
His "secret" was it was easy and he did nothing.
Member Shadowsix has done a few Klingon Distruptor builds and quite a few more different builds. He sure has a nice signature so try to take a look