Warehouse employees have expressed outrage over a new promotion led by the retail giant.

The 'ring the bell' giveaway scheme involved staff offering lucky customers $100 off their purchase on Thursday, Friday, Saturday and Sunday.

First Union acting secretary Bill Bradford says workers are frustrated that the company could find money for this promo- but not pay rises.

"They see the owner of the store throwing money around like confetti, as far as they can see it. There's no money for them, and they're the ones who do the work and make the profits."

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