I searched everywhere for the pipe and fittings about three years ago and finally found the 2729 pipe and fittings at Ewing Irrigation, 3820 N. Toben, Wichita. What I remember, the pipe price was good but the Y’s were about $30 which is more than what I’ve read on the forum. They couldn’t get the large radius elbows so I used two 45s. I noticed Lowes now has the pipe. Good luck with your setup and welcome to the forum.
12/15/10 My local Lowe's has the SDR35 6 in. pipe not the ASTM D2729. They do have the D2729 in 3 in. and 4 in. pipe and fittings.