The Speaker would be the source of all grimoire related info. Just go to him, your cards pop up. You click on it and he does the voicing of explaining. No more "I could tell you how..." he just does. Class items sold by Spearker would be sold by the respective Vanguards commanders,... duh. Motes, Glimmer, shards, materials, etc, would've been sold by Tess. Banners would be sold by the woman who already sells banners. Looking at it all, a lot of this should of been common sense for them to do.