For now there are two ways of obtaining Speedloader Slacks:
The answer is simple: we are offering the cheapest price among competitors and keep following high standards with that price, it's confirmed by our 4.9*/5 stars rating on Trustpilot from over 7000 customers. We are always ready to price match if you find cheaper!
For Legendary Campaign:
Lightfall DLC purchased;
Lightfall Campaign not completed on Legendary difficulty.
For Lost Sector:
Lightfall DLC purchased and campaign completed;
1815+ Light Level;
Weapons with mods that can stun all three types of champions (unstoppable, barrier, overload);
Any 30 legendary weapons in the vault and character inventory;
All types of damage weapons (you should have Void, Arc, and Solar weapons on your account).