US retailer Supervalu has said it will give consumers an extra US$30 for every $300 of economic stimulus or tax-refund checks that they exchange for store credit.

The offer is available from 2 May to 31 July at all Supervalu formats.

Supervalu is the second US grocer to launch an offer linked to consumers' tax rebates.

Last week, Kroger said it would offer bonuses to consumers who trade in their cheques for company gift cards to be spent in-store.

"We recognize that in today's economy, consumers' budgets are strained," said Jeff Noddle, Supervalu chairman and CEO.

"At the same time, however, they still want to feed their families fresh and healthy meals, affordably. We're always looking for ways to help our shoppers stretch their food dollars even further, and this is a programme that we hope can help them achieve that."