MrSkin.com was offered Leighton Meester Sex Tape, but he passed on the offer. Looks like whoever is trying to sell this sex tape is getting pretty desperate, since MrSkin is definetly not known for selling sex tapes.
It seems both parties didn't agree on the release of the sex tape so its doubtful somebody will try to buy it.
In the end these kind of sex tapes just end up on the internet, which is what will probably also happen in this case sooner or later.