Ok I guess this works at all Wal-Marts with the self checkout it works at the one near my house. Scan your items as normal and when done scanning everything pick to pay using cash now when its ready for you to insert the money lets say your buying a movie thats $16.14 with tax. Well just insert a $20 dollar bill and as soon as you insert the bill start shuving change in the coin slot. If you do this quick enough with the change the machine will spit the $20 back out and only keep your change and it will print a receipt out. I dont know how but somehow it confuses the machine. Im sure though when wal-mart catches on they will make changes to the machines. If you try this tell me if it works where you live to I thought it was perty kool.