Ral Partha UK have some of the older castings (not unseen) that are not available from IWM, and they also have the Mechforce UK variants. On top of that, they still sell some of the IWM stuff that IWM have put in their back catalog and charge a premium for, so it's a good place to get stuff from. That said, they don't always have what they say they have on their website, and they also get new stuff six to nine months after IWM releases a model. So horses for courses. Even in the UK, I buy direct from IWM sometimes.