Figure out what plastisol you're going to use at a cost per gallon basis then divide that into how many ounces per shot it takes to make the senkos. Most everything i make i do either 4 or 6 ounces at a time so i could easily figure it up as far as how much the plastisol costs per shot, but don't forget about covering the cost of glitter, colorant, hardner, softner etc. on top of that to get a good close idea. That's not figuring anything for your time, federal excise tax or any other cost that may go along with it.