Overmelds on i90 accessories, you want to buy a lot because you are having to do many 7-12% melds and it makes sense to just overestimate the amount you need and sell the leftovers at the prices you personally inflated. I probably bought more than a stack doing my overmelds. Though I don't think you could ever put pressure on demand with that sort of supply, and my condolences for materia prices on your server lol.