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I have not used these products before but Smooth-On makes a pourable casting kit that sells for about USD $50. It appears to be pretty good and they also have different formulas that are about the same price and even better suited to this, though they don't come in a kit form so it ends up being slightly more expensive overall.
I really want to get some of this stuff to see how it works but I don't really have anything to cast so it'd be kinda pointless. Still... it's only a matter of time before I run into something and think to myself "I really wish I had a few more of these things".
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