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All colours are available here by the look of it
https://www.edgesportsuk.com/store/juin-tech/road-cx.htmlThey are pretty good brakes, certainly far better than Spyres, at least with Campag levers. Have read about some people having issues with them though. I'd recommend compressionless outers and metal ferrules.
I believe the only maintenance required is dripping some mineral oil around the pistons/seals to prevent them sticking.
Got the R1s from eBay via Ireland for £125, you can get them direct for less but risk import taxes.