I bought my Sony VW11 from PRC in Forest Gate For £4,150 bak in March then used a web based retailer to price match for the maximum £500 back.
You need to send them your BC statement showing the purchase and proof of the price you're matching against. It took less than 24 hours for them to agree the match but about 2 weeks for the money to be credited to my BC account.
Why would barclaycard do this ? It must cost them a flippin' fortune.
In 'normal' circumstances a buyer has to make a judgement between paying the lowest price possible over the Internet or paying extra for service and backup by buying from a local 'bricks and mortor' dealer. In this situation Barclaycard seem to be willing to pay for that benefit on your behalf. Madness. Don't they even ask why you didn't just buy it at the lower price in the first place ?