Gumball sprials are great to use but I look to buy them used off of craigslist. I would stick with the little single GB machines. Tried and true. The average per machine for a single head machine is aroound 7 bucks a month I have heard of 20-30 a month. The thing about the sprials is you can have a long time between service. Like months most also are place under comission usally at 25% even at that commsion your making a good 2/3 mark up on your vend.
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