Actually, while Lowes prices seem to be higher than some internet sources, PVC is still way cheaper than metal.
Here are some quick links to Grizzly's site. And Grizzly usually has good/competitive prices:
Pipe http://www.grizzly.com/products/6-Di...ion-Pipe/G7364
Blast gate http://www.grizzly.com/products/Indu...-Gate-6-/G7358
Elbow http://www.grizzly.com/products/6-90...on-Elbow/G7369
And PLEASE don't bring up the static in PVC argument.....or tale....
Where is that pic of Piccard and #1 with their heads hanging....ugh!