A lot of us in the US still pay rent in checks. I get them from my bank in books of a hundred, and there’s no upper limit on how big they can be.
Anything that risks bouncing requires getting a fancy check (certified) where they take the money out before issuing the check.
In this case the bond is because he’s appealing a civil judgement that’s been reached. This is different from a bail bond. He’s not at risk of jail over this unless he gets in contempt of court.