There are actually quite a couple out there! Here 
are just a few:

Usagis House: OP from 2nd? season:  $150

Asylum Anime: Shampoo and Ranma OP: $350

Asylum Anime: Shampoo w/ Flower: $??? (a lot!)

Asylum Anime: Akane singing: $275

Ok...here's one problem. The Akane singing isn't 
labeled as being an opening. But anyone who's 
seen the import will recognize it as her singing 
the Good Morning opening song. Strange.