(Such as a kitchen vacuum sealer, a tire inflator air compressor, or a 'nebulizer' air pump.) The vacuum former described here will work very well with an inexpensive high vacuum system, getting professional quality results for thick plastic, for under $100.
The cost can be under $50 for a high-vacuum system for thick plastic sheets up to about 12' x 18', using a converted bike pump, or an electric air pump of some sort from a thrift store. For thick plastics (more than about 3/32' or 1/8' thick, depending on several variables) you often need a stronger vacuum than a vacuum cleaner will provide, and again the cost and size of the equipment are roughly proportional to the size of plastic sheet you will be forming. For larger stuff, you need a custom oven-not very difficult or expensive to make, but a little bigger all around than the plastic it will heat.
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