I got the same "invalid" status for the reason of not combining with other promo. Did an online chat with Ralph, and was told can't be combined with Staples promotion while admitting that the rebate term was not clear and it was not my fault. I was given an "one-time courtersy" from the rep. Now my rebate is showing as VALID. Finger crossing now. My suggestion is to do online chat and tell the rep that the T&C is not clear. Good luck to the fighting.