When I used to do that it was a $3 fee. Flat.
But $3 here and there for that kind of shit adds up fast.
It’s also not uncommon in these communities to have to pay cash for certain bills because they’re already well passed due. If you’re already months past due on the power, and checks have bounced. If your water is off and you need it on today. It’s gotta be cash, or a money order at 10% fee.