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Market Promotion Extended (September) page
A couple more things: the price listings should probably be changed to display one decimal point, which can matter a lot for low-price items (e.g. I just entered 3.9 for Radiant Shard but it shows up as 4). With something like shapestone, most of the price variation is only seen in the first decimal position!
Also I had an experience similar to what 
solar_eclipse_ mentioned below--after specifying that Shadow Air Gem Boxes are not tradable only 18 hours after the first time I noted it, it came up again immediately in the queue and I was able to specify "not tradable" again only seconds later.