Explore: Unlocking all of the quick travel points (save San Fran) as soon as you get your runner allows you to quickly move around the map and check shops.
At EGO 100, advanced weapons such as BMG, rocket launchers and grenade launchers start appearing as drops and on vendors.
If you have a lot of Scrip, break down weapons for Ark Salvage and use that to buy keycodes for lockboxes, or to add mod slots and mods to your equipment.
