If you're on the public test realm for patch 3.1, keep an eye out for the new glyph vendors in Dalaran. According to Dresorull, there's a vendor for each class located in "The Scribes Sacellum." They will all have glyphs available for sale.

As always, the purpose of this addition is to test for bugs. If you find any, be sure to report them using the UI tool or the official forums.

If you log in and don't see the vendors, Dresorull has said they will spawn back once the servers are stable again.