The best alternatives to WeSupporter are Swing Left, Guesser, and MoneyVoters. If these 3 options don't work for you, we've listed a few more alternatives below.
Stop donating to causes you don't believe in! Every year corporations use the money you spent to fund political campaigns. MoneyVoters is a free extension that lets you know the political party of the store you are buying from and gives you an alternative.