Another data point:

The current HIS I'm at offers M-F dry cleaning via a company that's about ten minutes away which does dry cleaning for a lot of area hotels. They supply the slips. The slips have no pricing on them, no turnaround times and no names. Whatever they charge comes back on a paper that doubles as the hotel's invoice which the guest never sees and we add on (depending on who is working) 25% to that total. Maybe two bags a month go out. We no longer put laundry bags in rooms as guest's just take them for extra take home storage. Bags aren't crazy expensive ($120ish per 1000) but it's an expense the management company has chosen to do what they can to avoid.