Does anyone know of an up-to-date resource that can be used to look up which, if any, mileage program a company is partnered with or the portal to use to get those miles/points?

For example, I know I need office supplies and don't want to go from one airline partner page to another to determine which portal should get miles/points credits if I purchase through them. Is there a way to look up Office Supply Company XYZ and find out which portals offer points for Office Supply Company XYZ?

I have spent too much time comparing portal pages lately.