Type the name of the card on ebay and then search. There is a filter that you can use in the search engine, choose sold items, it will show you the prices of items sold. However for Best offer accepted items, it will only show you the original buy it now price, not the accepted offer. There is a website called 130point.com that allows you to see the actual accepted prices. Local card shops are also great sources. Not all card shops are built the same though. There are card shops where the owners are very helpful. Post a list of your cards here, there are a few people here that may be able to help you too.