A typical doorbuster deal is an item or selection of items which is given a special discount price for a limited amount of time. This offer is referred to as a doorbuster in reference to literal incidents in which doors were broken down by a flood of people struggling to get the goods before they sold out. Doorbuster deals are usually employed on major shopping days, such as Black Friday and Boxing Day.

Цена такая низкая, что толпы выламывают двери в магазины.
Русский эквивалент придумывайте сами.