[Talus]

The cheapest skillup items tend to be the fletchings. You just need to check to make sure you are high enough to make them, i.e. chocobo fletchings, yagudo fletchings, bird fletchings, insect fletchings.

Always use advanced support unless you like failing a lot. The key to any craft is if you want to raise it fast, be willing to take a loss. If you take it a little at a time you won't lose as much (i.e. farm your own materials).