Help Needed - Glass Source

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Hey kids, I need some help here!

I have a probable commission coming up where I'm going to need some custom glass enclosures made for exterior lighting. At present it looks like I'll need twenty or thirty glass cylinders about 4" diameter by 16" tall, with one closed end. They'll probably be clear glass, or cloudy/streaky - I don't think we're looking at colors at this point, anyway.