What is the fine-grained topic of the following text: The most expensive item with a signature of Mother Teresa (Mother Teresa Autograph Letter Signed -- PSA/DNA COA) was sold on eBay in June 2013 for $5000.00 while the cheapest item (KEVIN CONNOR DIRECTOR SIGNED AUTOGRAPH DOCUMENT- MOTHER TERESA) found a new owner for $1.99 in December 2013. Only return the topic.
Sale of signed Mother Teresa items on eBay