I see those tops every day.
Sellers on ebay sell them starting at around $18. All of them are CD (t-shirts mainly) from previous seasons. Most are from 2001.
Honestly, I have purchased from them, and so have "snobby fashionista" friends of mine, and they are the geniune articles. However, they are deadstock and some are factory defects I believe, as someone I knew purchased one that was printed with the Diordiordiordior blue denim logo all over it, and it completely came off when they washed it.