thats what i used to do before someone on here told me about the prink trick. it comes in handy when there are only a few completed listings, so its harder to judge a fair priced given the limited data.
woah. shocked you don't know. You go to the original listing, and then scroll down until you see the ebay item number and there is also a "report listing"' and "print" link above it to the right. click print, and you will be able to see what the actual offer accepted was.