Cooltube Glass

So I want to make a cooltube. For my purposes, a bake-around is worthless, as I need a tube at least 6 or 7" in diameter. The problem?

I've spent the last week looking EVERYWHERE on the internet, and apparently a 6" around glass tube, 18" long is an impossibility to find?!?!? Emailed a few glass supply places, got no response (I'm assuning because I only want one).

So where the hell do you get a glass tube? It doesn't seem like it would be this fucking hard....

I might as well go into business selling cooltubes when I do find one, no wonder people get away with charging ridiculous prices for them when the materials are so hard to come by.

I found some on line that are 5.5" di. sorry I can't find the site. I use it for 400w mh and hps conv. bulb. I have extra if you pay shipping I'll send ya one. they only cost like 5.00. I tried to post a pic but I can't seem to get it to up load.. the site's been a little glitchy the last few days.