I saved $300 dollars 5 years ago by buying a second hand BCD and REG from the internet. It is a great piece of equipment. The only problem is that I have to pay every year to get them serviced, in which, has cost me more than $300 total so my savings are gone. I bought a set from my LDS and they service it for free for life ( parts not included if it ever needs any) In the long run I think I saved buying from the LDS. Without the LDS we would have to go on line to get air so lets support them. So for my BCD and REG I buy LDS.