Originally Posted by sdsearch

But don't price shop at the same store you're going to use through portal in the same browser that you'll use for the portal (or else use private/incognito browsing to keep them separate). Some portal shopping gets confused (to the point of not earning anything) if you go to store X without the portal, then turn around go to store X through the portal, because the store remembers your cookies from the non-portal visit and applies them to the portal visit.