It's hard to get a general scope of all the conquest item's offered, as it's my experience that the items available change, likely based on the amount of stuff you have conquered as a nation and/or your rank in the conquest system (1st, 2nd, 3rd.)
For example, I have some Royal Footman Clogs, and at one time it was a conquest point item I remember you could purchase in San D. for points when I started the game. At the time I lacked the points/rank/lvl to buy them. I went back a bit ago to grab it, but lo and behold, since San D is like, dead last on Bismarck, it's nowhere to be found, and each catergory has fewer items for sale. I would be curious to hear from a Taru on Bismarck to see if it's true, becasue they are ranked first. Currently I see anywhere from 3-4 items available per rank.