http://www.premiumcollectables.com.a.../transformers/
http://www.facebook.com/premiumcollectaus
I found these guys while looking for a Generations Jetfire a while back. There was some confusion from their supplier and he ended up being shipped to their warehouse instead of my own home. When we discovered what happened, the issue was sorted out very quickly via express courier and I was a happy camper in the end.
Prices are very competitive and they seem to be ramping up their Transformers range now to include more of the cool stuff. I've since pre-ordered a bunch of Wave 2 Combiner Wars as well as MP Star Sabre from there so I'll post an update after they arrive.