You can buy discount tubing at www.http://www.awesomeevent.com/Acrylic-Columns-C85.aspx
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Clear Tubes by: Anonymous
Believe it or not I used "8' clear tube guarde" used to store and protect flourescent bulbs. I found them at my local Home Depot Center. The platic is thin enough to be able to cute down to size with scissors and strong enough to hold the balloons. I made these for a birthday party and used them as center pieces, they came out great.
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The perfect solution ! by: Anonymous
www.abncparties.com and www.awesomeevent.com has exactly what you're looking for.
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TAP Plastics by: Ritabelle
Go to their web site at www.tapplastics.com. They have a great variety and can do special orders. I saw a giant martini glass 4' high they did.