I been trying to research armor sets, mostly Lore sets, and while at it noticed how Lore sets are bought with different tome currencies, and that many of the old currencies are considered obsolete, and if I understood it right, some of the stuff is entirely gone from the vendors.

By now the old stuff is not competitive, but there are some things I look at and really want just for the sake of looks. So my question is: are there any ways to still acquire these old armor sets? Or once these are gone, they gone for good?