For that crafting quest you get in MB you need TONS of scrap irorn. How do you get it? p.s. I've allready looked at the bazar and there was no scrap irorn.
You have to go farm it. Certain areas have Scrap Iron respawn points. You can find maps detailing this on Wizard101 Central.
The area near Timmy Icepick has a couple of respawn points. If you go from realm to realm, you can get the Scrap Iron you need, but be aware that others are doing the same thing, so it may take some time.