Ahh, I understand better what you're saying now. Unfortunately, SE has not separated the regular items from HQ ones in the Market Boards categories or subsequent listings of items. They are all listed together under each item's individual page. Meaning, click on each of the items you are interested in and scroll through the list of ones currently available for sale. Scattered among the regular ones will be the HQ (usually near the bottom of the list, as they tend to be higher priced than the normal quality versions). If you are still only seeing normal grey ones, then you can assume that there is no HQ currently available. You have to pull up the actual sale list per item to see these, though.

I would suggest clicking on several crafting material listings to see what I'm talking about. Most low-level materials have a multitude of items currently for sale in both qualities, and you can better understand what to look for in the accessory listings (which may not have what you are currently seeking).