For just the bonus? There are plenty right now.
https://www.creditcards.com/signup-bonuses/Summary: There are several offering $150 and $200 sign on bonuses.
Just for the ongoing cash back? Depends on what you spend money on.
Citi DoubleCash is 2% everywhere.
Citi Costco card is 4% for gas, 3% for restaurants.
Uber card is 4% for restaurants. (Also has a $150 sign on bonus)
American Express Blue Cash is 3% at grocery stores. (Also has a $150 sign on bonus. There is a version that is 6%, but has an annual fee.)
Discover and Chase have cards that have 5% categories that change every quarter.