Welcome to the page on any merchandise by Mercedes Lackey. Well, not exactly the page. If you'd like a full list of stuff that is available, you'd have to go to Firebird's. I'm not allowed to advertise though, so all that I can say is that you'd have to see the stuff to believe that they actually exist.
Misty used to write filk. Note the "used". She stopped because of some problems. Filk is essentially music based on the books that she wrote. For example, the characters in the book may sing a song. Misty could then write the lyrics to the song and someone else would write out the tune. If you've read her "Valdemar" novels, you'd be able to see the lyrics to the filk behind some books. That means that tapes and CDs of the filk exist.
Another thing is that Misty has sparked off an entire line based on her popular "Valdemar" novels. Jewellery, stationery, pins, perfumed oils, clothes! Anything! Of course, they're only available through Firebird, sooo...
If you'd really wanna buy the stuff, I suggest that you follow the link. ;)