Hi, A coworker, hearing I'm into trains, has asked me about Lionel train sets. Possibly the Polar Express. I told him I'd look for ads in my magazines but have found Model Railroader ads don't sem to include O scale. I really don't know if the Polar Express is a decent set, is it? Any thoughts on what a reasonable price would be? If you can advise a good mail order or online source, I'd appreciate it. Thanks.