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Not sure where the stuff comes from
I assumed it's the stock that Rapha could only sell at prices that Rapha can't afford to sell at. I'm guessing they are specialist sportswear clearance merchants who buy bulk stock clearance then carve a margin on even on what appear to be quite low prices through low operating costs and efficient ops. Seems fairly common if you look around eBay. There's a similar outfit that does clearance for CSG.
The kit is 100% legit in my experience.
Yes, they've been going for years. Not sure where the stuff comes from, lots of random sizes and different collections. Some kind of small scale clearance that they don't want to do under the Rapha brand I imagine.