I am used to having to search thread forums alot when I had to teach myself on how to jailbreak/unlock my iPhone 3gs but DAMN... I cannot believe how secretive/stingy the scumbags out there are that keep the Cricket/Metro flashing procedure hidden just so they can extort guys like you and me for a couple of $...
I was searching for 4 days straight on how to get the Evo flashed and working on MetroPCS and every thread would have some A-hole posting "Oh it can be done... IF you pay me $50 and send me your phone to flash it" to which I would say...
Ummm that's not what I was asking idiot. I wanted instructions so I could do it myself
Here's a the best thread I found tho with actual instructions on how to flash it to Metro (which I assume is the same as Cricket)
[GUIDE] HTC EVO on MetroPCS!! - xda-developers
Hope it helps