1957 Air Cleaner Wanted

Hi. Looking to buy an air cleaner for a 57 for my dad's resto. I'm a student (but yes, this is his log-in) so I need one that doesn't cost an arm, leg and four kidneys! I've seen them at Larrys etc but I don't have that much. Does anyone have one at the back of their garage that isn't terminally rusty or dinged that I can buy for sensible money $$ or ££ please? Thanks