Hi kell490,
Another way to approach this is to look for regulators that you can openly buy parts for, online. These brands will sell parts to the public via online vendors:
Zeagle
Edge/HOG
Dive Rite
Maybe Mares (I say maybe because I have been able to buy parts online, but I don't think it is "official" company policy to allow this. I'm not sure).
Rebuild kits are not super expensive. ZeagleExpress charges $20.00 for the first stage kit, and $12.00 for the 2nd stage kit. HOG rebuild kits are about the same.
You will need to invest in some tools and gauges; Scubatools is a good place for these:
Scuba Tools
I'd recommend Vance Harlow's book and Pete Wolfinger's book, and you should try to get the manufacturer's service manual for the regulators you decide to rebuild.
This forum and the DIY forum are great resources, and folks are very willing to help.
Best wishes.