ibsenhenri
Hello & Welcome to the Forum!
A Tin Plate Fanatic already, your son shows good taste... lol...
He has certainly chose some very fine trains to begin the hobby with.
You didn't say whether he is interested in O Gauge or Standard Gauge
trains, there is a price difference.
And then there is the option of a vintage/antique set, a restored set or a reproduction set(MTH).
To be sure, you will want to hunt all the online dealers and auction sites looking for the best prices.
If you do evilbayou, look at the prices of the sold/completed auctions not the auction/asking prices
for a price range that is realistic. The other online forums do have classified ads that you can view
as well as the for sale/trade sub forum on this site.
Track and transformers are readily available, both new and used.
Not certain if this is the model your son was seeking in Apple Green, but if you look at my gallery photo's
there is an antique Lionel set that may be what your son was referring to, or close to it.
If l remember correctly, it was around $100 when l purchased it a few months back.
I hope this is some help to you, if you wish, you can pm me here if I can be of any help.
I do have a combination LGB/Bachmann Great Northern Train in G scale for sale.
Happy Rails!
dave