Value of Lionel Commemorative Items?

Between $30-$50.00 or what somebody is willing to pay. 

You are probably not terribly far off for most. 

I think I paid something like $80 for the Madison Piggyback flatcar, but it was the late 90's  - very different times.  It's all dependent on if someone "needs" one.  I haven't priced one lately, but I'd suspect even if you can't get $45-$50, you should hopefully be able to get $25-$30.  (all IMO)

I'm not familiar with that particular Carail piece, but they used to be somewhat desirable.  On a similar note though, I seem to recall getting a different Carail piece in a blow out deal years later for something around $20-$25.

The CC cars are actually CCI, not CCII.  If you can find someone who actually wants them, $20 might be fair, but some dealers who are getting tired of sitting on them may go lower.

The Miniature Railroad and Village is part of a series for the Carnegie Science Museum, there may be interest there if someone interested in that series is missing that particular car.

You should search eBay for the particular item #s and view by completed (sold, not just ended) auctions to get an overall feel.

Good Luck.

-Dave