Cantha Skill Trainers - Skills NOT Acquirable Through Quests?

Anyone know if there is a resource out there that is similar to this one for Tyria?

http://gw.gamewikis.org/wiki/Trainer_Locations_Table

I personally only like to buy skills if I know that they are not acquirable via quest, but can't seem to find anything for Cantha.

After the starter island there are no more skills as quest rewards.

That's helpful. What about those that are available on the starter island? Are all the skills available at the trainer acquirable through quests?

Not all the skills at the skill trainers (on the starter island) are available in quests. In fact most skills are obtained from the first and second npc profession visits, the "advanced" training with Ng and maybe a couple others. You basically hvae to buy most of your skills.