Are you referring to my link? My reference point to cost savings may be dated ... I know that the linked carwash supplier back in the year 2000 had a better deal than what the laundry distributers had at that time. It is possible though that currently the laundromat distributors are giving the better deal.
Hopefully without hijacking EJ333's thread ... the carwash supplier does have a better value for their variety of comparative metal coin mechs than the laundry industry. Of course if some laundry manufacturers or vice versa make the mechs a challenge to physically fit them... that is a consideration at this point in time.