I tried AAA but they were 1200 for mine. I ordered from canyon whitewater inflatables. They build fancy stuff but also build the simple stuff with fittings for the cheapest I found. Which makes scense I guess . No sales tax out of oregon either.
I have been having the same frame curiosities, I just ordered a 4 bay frame the same you are talking about for my new Aire 130D. I guess I will see when it gets here. It was 899.00 for the frame and rails so I have a little money left to tinker with it.