Last year, and you are only just looking for it now,  hardly in desperate need.  Did you actually cancel the postage label, or did you just not print it.

And seriously you are complaining about the cost of having to buy a printer, thats hardly an Ebay issue.  

Do yourself a favour and don't sell on Ebay, if you don't know the basics of doing business.

PS.  most likely to late to claim any refund if you have let it drag on so long.