The Cortex core is the only keyboard that you can buy assembled. Compared to the others, it's rather cheap at only USD 114 (+ shipping and taxes). It comes in Cherry Brown, Blue, Red, Clear, and Black. You can also buy on Amazon for about CAD 280.
I have been thinking about replacing my Realforce 87U but not quite sure yet. I'd probably go with the Vortex just because of price (and it looks awesome!).
Anyone interested in splitting shipping to Halifax? :)