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Set a limit (for example - between $150 and $175) and a target (for example between 10 and 12 items). Students must work their way through a shopping catalogue and complete this task.
You can create any number of limits and any number of targets depending on the catalogue you chose. Have a couple extra for early finishers and have a bin ready for the rubbish.
Keep a couple of new catalogues in your bag of tricks. This will be a noisy task and is best completed just before a break.