Every now and then I'll hear about some paid app that have gone on sale for FREE temporarily. I know there's quite a few of these sort of offers going on every day. I just want to be able to "buy" it when it's free so I can download it for free if I ever come across it and think it would be useful. I've been doing this manually, but isn't there some app for Windows or Mac that could take care of this for me so I don't have to bother keeping up with sales? Any suggestions are really appreciated. Thanks.