I'm going to assume you already seached gnc/vitaminshoppe/etc for pepto pro and found that they don't sell it in the raw. For pure pepto pro, your best bet is True Nutrition.*** I would just wait and do this***
However, your deadline leaves few alternatives. You will have to settle for some of the products that integrate pepto pro that you could go pickup today (assuming shipping overnight is not feasible on a Sun.). In this case, VPX makes some products, Synthesize, Stealth and Shotgun, that integrate pepto pro into their blend. You can purchase these VPX products at most big chain nutrition stores.
Lastly, Biotest Mag-10 seems to be similar to pepto pro and I know it's been mentioned before on Shelby and Mt. Dog's podcast as a good product. It might be something to consider in the future.
Hope this helps a little.