+1 for Horizon.
10' stick of 6" ASTM2729 was $16
6" wyes were about $12
6"->4" adapters about $10
I grumbled a little about the price of the fittings at first (he wanted to charge me something like $23/ea), and somehow, the prices all came down by about half. I think that was the "you don't have an account" markup being removed