What sort of regs do you have?
Unless you work for a dive shop getting the tools, spare parts, and manuals required for some brands can be very difficult.
I think $20 per stage per year is not that much for a sport that can cost thousands per year in travel, gear and accomodation. I see servicing costs as my contribution to the local dive industry, and it gives me a chance to catch up with LDS staff.
If set on doing your own regs then vance harlows
books at airspeed press are probably the best starting point on reg servicing and dealing with oxygen.
The book has good tips which help when stuck in a remote location - but even working in Outer Mongolia I still get my regs served by a pro when out on break: some tests such as cracking pressure and IP hose pressure are best measured using the correct tools.
Cheers,
Rohan.