The list that CJMeyers sent is good as I use it to find what is out there. Pricing McCoy is kind of hard. I m sure you looked on eBay and found that the prices are all over the place as with other sites.
When looking do not forget to add the price of the item with the shipping as this will be the true cost.
Watch out for overpriced shipping when doing this.
There are a lot of folks here who may more experience on this McCoy pricing. I purchased McCoy items from the forum as the items were price right and from eBay.
Have about 25 pieces of rolling stock with one McCoy 4-4-4 engine.
Nice tin plate just keep everything oiled.
Since these were your Grandfathers you may just want to keep/run them and pass them down as he did to you
