Maverick42,
Here are a couple of places you can try, I am sure they both have teh new flags as well as about any other reproduction parts for American flyer trains and accessories.
Aflyer
Joe’s Train Repair
FAX Orders: 919/471-2613
404 Shetland Road
Rougemont, NC 27572-9338
Specializing in S Gauge.
American Flyer Parts Dealer
Authorized Lionel Service Center…Over 85,000 AF parts in stock with more than 1,300 part numbers…
American Models.###.DesPlaines Hobbies.###.S-Helper Service Showcase Line
joestrainrepair@yahoo.com