We have one about 7 miles from us and I checked it out because I didn't want to try and get Angus into the tub and didn't want to leave him at the groomers all day.
They charged $15 for the first 30 minutes and then $5 for every 15 minutes after that. You provide the soap, conditioner, towels, etc... But if you wanted to use their stuff there was an extra charge but I can't remember how much.
Good Luck!