Masquerade depends. If the bubble is in good condition, you can pay anywhere from 45-65 for her. I think I payed 45 for mine. Her bubble has a small chip in it, but it isn't yellowed, and the card is as good as a 20 year old card can be.
It really depends on the seller. I bought mine in bulk so I got price breaks. I don't suppose I'd pay more than 75 at the absolute most though. She pops up for sale enough that I'd wait.