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Did he say it was holding up your order, or did you just ask if they H100i was out of stock?The live chat guy told me my cooler was out of stock on mine. Then by going to the 'amend' section on my order it also showed the cooler as out of stock.
If you try to amend a product that's out of stock, of course it won't be available as it's trying to allocate stock that doesn't exist.