You can't buy the blocks, but you can buy the "raw" gelatin. It's in a powder-like form when you get it and must be mixed (with water) according to instructions, allowed to solidify and used at a specific temperature. And it must be calibrated with a steel BB at 600 fps prior to use to confirm that it is within spec.
In short, using this stuff according to rigorous scientific protocols is a real pain in the butt. It is not a quick and dirty procedure. And if you want to use a lot of it you better have deep pockets.
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