At SIDETRACK HOBBIES we have both the Lionel Classics version (new) and LCT versions w/ PS3. New LCT sets (two-tone blue w/ nickel) can be purchased as 3-car or 5-car sets.
We also have two-tone blue w/ brass 4-car sets as well. Matching 400Es have red wheels.
Search "comet" on our website.
I am assuming you are interested in Standard Gauge. Give us a call if you have additional questions.
Thanks