eBay has a completed listings search that's invaluable for research. Type in your search keyword at eBay, when the results come up scroll part way down, on the left side there's a box with different options. Check the "Show completed listings" box, and re-search.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .