I don't know if this will help you or not, I have a UPS account and do my own shipping labels online. I always print a return label and put it in the box for shipment back home. The box is at bell services when we arrive and we give it back to them when we depart. Bell services hands it to the UPS delivery person and I get it about 5 days later.
The return label cost 50 cents to print whether you use it or not. My credit card is then charged at the time of actual shipment for the return charges. I would think any UPS outlet would have a similar service available to you.