Staples price match is as follows:
"If you find the same product at a lower price elsewhere, show us the price and we will match it and give you 10% of the difference (up to £25 inc. VAT) up to 14 days after your purchase from Staples. The price promise does not apply to technology products appearing in any catalogue or on-line offering. Terms & conditions apply, see in-store for full details."
It would be helpful if they more widely published the full terms and conditions if they are going to use these as a get out.