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Your app is mostly functional, the only bug I could find was a caused by having one server-side value for keeping track of the dollar total leading to strange behavior with two clients open. The jquery code could use some reorganization and the variables could be named to be more descriptive. Comments would also make it much much easier to parse through your work.
Completion: 20/20
Bug Free: 8/10
Good coding practices: 7/10
Readability: 7/10
Total: 40/50