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You probably don't want to buy it online, as it is a hazardous material to ship and will likely cost much more than it's worth to ship. Check your yellow pages for plastics, plastic distibutors, plastic fabrication, etc. I am sure there are several local dealers.
Try a sign supply source local to you that may sell retail, or go to a small sign shop in your neighborhood that can order it for you from their wholesale supplier. Many of the plastic suppliers and big sign suppliers only sell wholesale. These glues are commonly used for neon channel letter signs and you can probaly work something out with one of the smaller shops to get for you.
agreed with sumphead look to see who sells plastics supply like sheets, rod, and tubes if they sell clear pvc or polycarbonate they should also carry weld-on 16 to bond these