Best way to get Globs of Dark Matter?
You can either put in buy orders on the TP for the cheapest exotics you can find or use dungeon tokens to buy armor from the dungeon vendors. Cheapest is the dungeon armor, but that would require lots of tokens. You can get exotics for under a gold each with buy orders.
I don’t really have a method other than what cranked said, but just a warning that salvaging an exotic does not guarantee globs. There’s a chance of 1-3 with every weapon, but unless they changed it, you can also still end up with 0 globs from a salvage.
You’ll need to discover a bunch of exotics on your way to lvl500 crafting.
Most of these exotics will have stats you won’t use, and won’t sell for enough to be bothered with on the TP – so you salvage them.
By the time you reach 500, you ought to have enough Dark Matter for at least one weapon (you only need 10 per).
The account bound exotics you get in fractals is good for this but make sure you wait until Tuesday’s patch before salvaging the armor pieces.