Sure, let me just go buy 3 super vending machines, oh hey look at that, metal is low today, so I can get these 3 super vending machines for 120,000 excellent, I'm going to make a killing... What's that? The price of metal just went up? And you still want 3 metal things? Well that's going to cost you, oh, lets say 950,000, young man. Yes? You stupid f... I mean, nice purchase sir, please shop at recettear again.
I had a guy ask for metal so I saved before he was due to show up and then offered him my vending machine (before I put it in the other vending machine to sell it) and he refused it. Of course I'm rather early in the game where few people have 30000 to spend apparently.
I offered him a vending machine and some metal armor and he said "nope, don't need that. Thanks" and walked away.