I have one in the mail right now from Anime-Export, but I'm still on the fence about the colours. Nice to know that TRU.CA finally has a prime in the works and at the relatively cheap price of $129.99 (same as MPM Bumblebee and actually on par with the US exchange rate. A little bit better, actually!).
Masterpiece Optimus Prime
Hasn't gone live yet so far as I can tell, but there you have it!