What makes you think you need the regulator. I don't think I've ever seen one actually go bad. The usual maintenance item are the two pressure switches.
I think you're right on the regulator, the seals are bad.. I need to check it more thoroughly.
But I will look to see if I can find the accumulator for a better price online somewhere. I am sort-of on a budget right now so I am trying to get crafty haha