For all you Mad Scientists out there looking for a chunk of plastic to finish your Cosmic Infindibulum with here's Colorado Plastic Products.
All the usual plastics in all the usual forms, plus several bins of leftovers which go on sale the end of every month at half or more off. You probably don't need a 4 x 8 ft slab of Delrin, and couldn't afford it anyway, but chunks measured in inches instead of feet and available in Delrin, Nylon, HDPE, PVC etc. are there. Odd lots are also available. Ask.
Click the link and sign up for notifications of their monthly leftover sales.