Great if you can swing the price match; it's not consistent with Staples price match policy. Quoted from Staples policy:
"How do Staples coupons and rebates contribute to the Staples price?
When calculating a price match, we?ll deduct any available Staples coupons, Staples Rebates (Instant, easy or mail?in) and manufacturer rebates from the Staples price to arrive at a net price. For example, if you buy an item from us for $100 and we offer a $20 instant rebate, the net price is $80. If another company?s price is $80 or more, we will not match the price. Another example: if you buy an item from us for $159 and you have a $30 coupon, the net price is $129. If another company?s price is $125, your price match would be $4.40 (110% of the difference). "
Good luck, though; obviously a fair number of people are still getting the pricematch. Staples online lists the $20 MS rebate; if it's not posted by the product at your B&M store you might have a decent chance.