Forged in Battle is going to have Ratte tanks available at Salute in the West Wind Productions booth.
What they have to say about it:
We will have 5 P-1000 Ratte tanks ( can I really say tank when this is a small town on tracks?) available at Salute 2012 you can pre order them by email or phone, we wont have them on the Forged in Battle website for a couple of weeks. The price is £95.00 , commence gnashing of teeth. The complete Forged in Battle 15mm WWII range will be available from the West Wind stand TB09.