Alright, I'm right at the end of the game, but I know I need to upgrade all of my gears at Joe's shop before I'll be able to beat him. (i suck)

Unfortunately, Joe is a whore and his items are extremely expensive, as you may or may not already know. So what I need is a recommendation on an enemy who gives out a lot of gold, or possible items I could loot for a high amount.

Assistance, please.