Henri has just bought one of the 4010s and is writing about it in the thread 'My first Playmobil'. he may end up selling it! The post is worth a read.
Sorry, I don't have any to offer you, but I have found that this sort of stuff almost never turns up and model railway shows or swapmeets, but it turns up a lot at G scale events and on e-bay.
A lot of it offered on e-bay is 'collect only' too, which can work to your advantage and keep the price artificially low, provided it is near enough to go and get!
The other place to look is car boot sales.
Playmofire, Walt and I have been into this for years. We love it! I hope you get what you need and if we can be of any help to you, please get in touch.
James