 2 options come to mind
If you use service like stamps.com you can pay for a label as you normally would but put the clients address in the from field and of course yours in the to field. As long as you know the weight and dimensions pay for it & Print it.
The eMail it to the client returning goods to you. Have them print the label you paid for and tape it to the shipping box. Depending on size they may have to drop it off at the post office otherwise any mail box should do for small items.
I do not have experience with it but I think you can have USPS go to the clients house and pick up items shipped via Priority pre paid.
I had 1 guy not want to go the post office and did not have a printer to print the pre paid label I e-mailed him. I ended up folding the label and sending it snail mail in an envelop.
The above low tech way will suit you fine if this is a 1 time thing.
A better long term solution for buyer satisfaction and avoiding neg. feedback is to include a sticker label with each order you ship. You will not have to pre pay the freight on the labels. UPS will only charge you if the label is actually used.
Feel free to write back with any follow up questions, I should be online a few hours tonight. Good Luck and  for going above and beyond to make the return more convenient for your difficult client.
Cheers
Last edited by Clay Davis; 10-14-2011 at 09:32 PM.
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Print a shipping label and send it to somebody on ebay how? 
