There is a setting you can apply to your Game.ini file that overrides crafting costs called "ConfigOverrideItemCraftingCosts".

If you are running a server your Game.ini is located in one of these two locations, depending on which OS you are running the server on:
ShooterGame/Saved/Config/LinuxServer/Game.ini
ShooterGame/Saved/Config/WindowsServer/Game.ini

The following list is provided by Steam user Praio77. Thank you! :-)

Click this link[pastebin.com] to go directly to Praio77's pastebin with the codes. Hopefully he'll keep this updated!

Copy the content and paste it at the end of the section called [/script/shootergame.shootergamemode] in your Game.ini file.