Check out the vendor NPCs in the adventurer's guild as they have really low priced gear that is well priced until around the mid-20's i believe.

I'm fairly certain Guildleves and sidequests reward a decent amount of gear now. Ul'dah guildleves can give cloth gear, Gridania leves can give Leather gear, and Limsa leves can give Metal gear. Sidequests have their own individual rewards so just look around for them and see what they offer.