I have a signed Mike Hargrove first base baseball card and was trying to find out how much it is worth

This type of card is in constant demand on eBay. To find out what the best offers are, list it as an auction but place a really high reserve price (millions) to ensure it doesn't sell for peanuts. This way, all bidders will see 'reserve not yet met' on the listing and not feel cheated, which they would, if you agreed to sell at a lower price but refused to complete the trade.

Good Luck.

Depending on which card you have, you might want to click on the following search and see what prices you might find there.

Mike Hargrove Autographed Baseball Card - Google Search (http://www.google.com/search?hl=en&safe=off&q=Mike+Hargrove+Autographed+Baseball+Card)