cordovacollector, sounds like a pretty cool item. The classifieds is definitely the right place. You should probably check out the rules on posting for the format as well as check out some of the items other members have put up. Below is a link to the guidelines (in case you have not already seen them)
http://www.gameuseduniverse.com/vb_f...ad.php?t=18001

As far as pricing, the idea of the classified is to put a price on it (no more than $500) that you will take for it. It can be a tough balance of not selling the item too low while still trying to attract interest. You also may want to consider posting a pic of the item as well. It goes a long way towards generating interest. There are a number of Ripken collectors on here so I am sure you have already received a couple emails on the card. If you need any more help, feel free to email me.