There are a lot, but like @nalor511 said, they tend to be ones where you have to wade through a bunch of stuff. DOC is probably the most comprehensive in terms of quantity/quality of deals and having all the accurate information needed to assess whether to do them.Here are some other sites that I've saved that might be worth looking at:https://frequentmiler.com/best-credit-card-sign-up-offers/https://madfientist.cardratings.com/https://upgradedpoints.com/As an aside, depending on where you live and how much extra capacity you have for these kinds of things, you could do both credit card signup bonuses and bank bonuses. https://www.doctorofcredit.com/best-bank-account-bonuses/ is a good resource for the latter. I don't know if these are both listed on the DOC daily deals page to which you referred.
Have you found looking at DoC every few days useful? I mostly just look at their Best Bank Account Bonuses page once around the beginning of the month.
everybankbonus.comI find it much better than DoC for bank bonuses, as I can set filters to only view ones for which I'm eligible. However, it's only for bank bonuses, so I still check DoC when I'm ready for a new credit card signup bonus.