There’s a class of merchant common to many zones in GW2. They sell some combination of salvage kits and tools. I suggest that if a merchant sells any of these items, they sell ALL TYPES. It’s nothing but frustrating to have to run between a half-dozen merchants out in the wild to find your preferred tool or salvage kit if you run out.
Yes you could argue that limiting selection in lower zones is necessary, but it’s not, as anyone can buy any item in major cities. Limiting tool availability in the wilds is just silly.
My blog, with possibly GW2 related posts:
http://rnd-diversions.blogspot.com/