Newegg.com has G.SKILL RIPJAWS KM780R RGB Mechanical Gaming Keyboard (Cherry MX RGB Red, Brown and Blue) on sale for $89.99. Shipping is free and 2-day ShopRunner eligible.
These were $99 last Black Friday and this is the lowest price for the RGB's.
The difference between the KM780 and KM780R is that the "R" variant do not come with the accessory pack that last year's model did. So it's lacking the gaming key caps, the puller tool, and the key cap box.