sports cards itemizing and pricing

[Thriller]

My father passed away several years ago and left thousands of hockey and baseball cards - sets and individuals. I would guess close to 100,000 cards. They are fairly organized but I want to itemize them on a spreadsheet and likely sell them at some point as nobody in my family has much interest in collecting. I'm wondering if there is some software or program available that can make it easy for me to itemize and get an idea on market value of the sets/cards while doing so. Preferably a free download would be great but willing to pay for a good product.

[stlcardinalsfan]

You can use the inventory manager here. its very easy to use. Price guides are pretty much a thing of the past, if you want real time value look to ebay. I also use COMC (check out my cards.com) to see value for cards.