I Bargained Expected Book Didn’t Loop Agreed Join

1. I agreed to join a book club because the saleswoman said I didn’t have to buy any book I didn’t want, but I was shocked when I learned I had to spend a certain amount of money every month. It was more of a commitment than I bargained for.
2. I thought you were looking forward to being in the army. Was it more work than you bargained for?

The expression is often used in a negative sense, i.e., more money, more trouble, more work, etc. than one expected or wanted.