I run a chore store, but I do not include, candy, or soda, just sugarless gum. The items are all "priced" in tickets. I purchased a roll of raffle tickets and I pay the kids in tickets for chores. The chore store is open on Sundays so they have a chance to save up tickets over the week. There are toys, stickers, character socks, anything you can think of. I also am working on coupons like, 30 minutes of video game time and such. I use those foil star stickers to price items.
Fun idea: If you don't pick something up after one warning, this mom confiscates it and puts it in a "ransom box." The only way you can get it back is to draw a task from the envelope attached to the box lid. Her tasks are hilarious!