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What size gumballs are used in trade stimulators? Also does anyone have a source? I have an imp and a American Eagle if it matters,, Thanks, PJ

1/2" or 9/16 will work. You can buy them at Walmart

I think half is too small but 9/16 would work. Thanks for the help.. PJ

PJ,
You may also want to consider using marbles instead of actual gumballs. Gumballs, if left to sit in machines, may start to stick together due to humidity and gum up the vendor mech. I found that solid color marbles (usually used for Chinese checkers) work well and look just like gumballs.

He asked for gumballs as he may want them for the kids. I only use Chinese Checker marbles in my machines. But if they are kids in the house playing with the machines use caution with the marbles.

I buy Marble King marbles from this source. Much cheaper than eBay.
http://www.landofmarbles.com/9_16.html

I'd be more worried about my Swedish wife breaking her teeth.. HA! no offense Swedish people out there ..PJ

I could be offended because I am a full blooded Swede.
You can always tell a Swede, but you can't tell him much.