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Here is a burning laser that I built nearly entirely from old computer parts, power is around 250mW. The power supply, multiple heatsinks, and laser diode all came from a computer. I had to pay for the Aixiz module and LM317 + resistors, but that only cost a few bucks. Before throwing away computer stuff, take a look inside and salvage the useful stuff! I'm also powering my 1200mW Blue laser with an old computer power supply.
Check out laserpointerforums.com to learn more about laser pointers, lasers, and laser pointer companies! I have been a member there for 8 years, and have received a bunch of help from the knowledgeable members there!