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For the Kobuki, going to Yujin would probably be the best option. They are a major manufacturer of robotic vacuums and so you are unlikely to find any source that can offer a better price. However, be aware that 300-500 units isn't all that much when you consider that hundreds of thousands of robotic vacuums are sold each year.

As for the Kinect, you might want to actually investigate their EULA as to commercial uses. Then, I would suggest finding out about availability, seeing as Kinect 2 is already out, and is very different (and not very robotics friendly in terms of openness).