Gunther Hall, Ltd is the only place I know of that is doing a calender this year. They claim they are making a very limited trial run this year of about 50 calenders.
The flyer I received from Gunther Hall says it will be a full color custom calender featuring many new for 2000 rides such as Lightning Racers, Boulder Dash, Son of Beast, Superman-Ride of Steel and classics like Belmont Park's Giant Dipper and the Dragon Coaster at Rye Playland.
The flyer also says that the calender was done by photographer and ACE member, John Fidyk.
I ordered mine last Friday, it was $17.95 plus shipping. The lady I talked with confirmed that this is a very limited run.