selling sounds card?

im looking to sell my sound card...how much should be a resonable amount to sell it for? its a Creative Labs Sound Blaster Audigy Platinum 2zs.

I always use ebay as a guide:

http://search.ebay.com/search/search...+ZS&category0=

Used one on there has a buy it now of $59.99

These days I tend to hold on to stuff as a spare in case something I have dies on me or to upgrade a family members machine.