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I'd say the yongnuostore link you provided also looks like the direct store.
A year and a half ago I opted for the YN560II and it plays well with my Nikon flashes in S2 slave mode for TTL triggering. They just don't shut off like a dedicated TTL speedlight does so you will need to set the power setting on the flash. Keep in mind that TTL gets fooled and unless you are doing gun and run type shots, manual will give you more consistent results. I bought mine from here http://stores.ebay.com/hkyongnuophotoequipment is direct from Yongnuo.