Waste Not, Want Not

Acquisition
Skill trainers
 * Eye of the North
 * Micah Fergson (Eye of the North)
 * Sida (Gunnar's Hold)
 * Ybbob (Rata Sum)

Trivia

 * The Mesmer in the skill icon is wearing Vabbian armor, and is probably the same person that appears on skill icons of Wandering Eye and Power Lock.
 * Idiom definition for 'Waste not, Want not': If you don't waste things, you are less likely to end up lacking.