Just noticed this when looking for deals to use with the LatitudePay offer.
$120-$279 purchase = $20 credit
$280-$439 purchase = $40 credit
$440+ purchase = $80 credit
Another $50 off if you use the LatitudePay offer (expires 16/10), so potentially $70 off a $150 purchase (47%).
Excludes gift cards, Apple products and several other brands.
Bonus credit expires 7 days from issue.
Check the T&C's PDF for more details.