Howdy,
I found most of my Lyman and Ideal moulds and dies on
www.eBay.com. Whether or not you agree with their policy on gun parts, etc, is beside the point. The concept of the auction open to the world is a great way to establish an item's true value. The down side is that if you list it, you'll have to part with it, unless you put a really high reserve on it, and that costs money.
Here's what I do: Go to eBay. Find a couple of items that most closely match what I'm interested in, and watch the auction to the end.
The all in one nutcracker with the mould on the end will bring in the neighborhood of $100, depending on caliber, nickel-plating, general condition. Popular calibers like .38-55, 45-70, 45 Colt, etc bring more than most.
Also, try
www.the310shop.com. This guy specializes in Lyman and Ideal nutcracker tools. He can give you a good ball-park figure.
Me? I'd try to figure out how they work and use them. I spent an hour at a a time with nutcracker tools, in the sleeper of my semi, and in one winter loaded over 500 rounds of ammo.
Good luck,
Bitterroot