The ‘Optional Opportunities Redux’ event is now live in Tiny Tina’s Wonderlands. During this event, you will get more gold in Tangledrift and Mount Craw! This limited-time event runs from July 7 to July 14 at 9:00 AM PT.
So if you want to buy those legendaries at the end of the Chaos Chamber and are low on gold you need to farm these locations. Otherwise, you should check out this Gold Guide for massive money growth.