Hey man, I recently was looking for a dust collection hose on the internet. I checked ebay and copped on a sweeeet deal. The dust hose from rockler is really nice, I was gonna get that, but I figured there's gotta be a better deal some where for the same thing. I purchased a Hose, 4" in Dia. 50 feet long, for only 50 dollars, including Shipping. So basically I paid a dollar per foot. It seems like the same stuff, and I got a larger distance of Hose, even though I don't use it all, still nice to have in case you change your shop around :]
So just look on the Netz! You'll find something.