There is a game-breaking bug that works for almost if not all items that have the '1 stack of blank' text that you can buy in shops, arrows, alchemical material, you name it. It basically exploits the fact that the in-game limit to items is 2,147,483,647. So I found out if you go to a shop and ask for 999999999 of said item, it GIVES YOU MONEY! If it doesn't give money then you can sell said item and gain some money then buy 999999999 of the said item again and at that point, it should give you money. The earliest you can use this exploit is at Teppas General Store, it works on the Balsa Arrows. Just thought I should point that it.
 "Quepland"){kind=icon}
 "Mutilate-a-Doll 2"){kind=icon}
 "Wizard (And Minion) Idle"){kind=icon}
 "NGU IDLE"){kind=icon}