Suzaku wall hangings can be found from the Zadnor lockboxes so the market is gradually getting saturated with them.

SE seems to actively dislike older glam/furnishing items tied to treasure maps or trials retaining value and thus continues to shove them into loot from deep dungeons/exploratory fields.

There are a couple oddball items that have not gotten this treatment yet, though, so those might be worth chasing after if you're trying to make money.