AACGS slabs worth anything?

A friend of a friend is selling a few things (Mostly novelty items) but I have never seen the AACGS slabs that she has. She also has a Columbian Exposition Commemorative Half Dollar that I may be interested in. It seems to be in pretty good shape from what I can see with the one photo that she sent. What's the going rate for an un-circulated?
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See http://www.doubledimes.com for a free online reference for US twenty-cent pieces
"grading services"
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
Keeper of the VAM Catalog • Professional Coin Imaging • Prime Number Set • World Coins in Early America • British Trade Dollars • Variety Attribution
well, the slabs (without coins) may be worth something to a recycling company
BHNC #203