I generally refill my machine once a months but on a couple occasions my machine had to be filled twice a month because the sales had been extremely good with certain products. The products that have sold the best for me were the Black Ink Temporary Tattoos, the Ed Hardy Celebrity Temporary Vending Tattoos, the Hannah Montana 2 Vending Stickers, and the MLB Baseball Prismatic Vending Stickers.
Overall this machine has been a great investment and I have already made my money back for the machine and products I have purchased. That means that everything I bring in now is profit after I pay for my products to fill my machine. At such a great price why not invest in one of these wonders or another great vending machine!