Thank you all of you guys for your help I'm trying to buy a used brompton but my budget is low (460€ max) for an M3L. I have someone to buy me the bike in London and send it to my country (Portugal). But until now I didn't find any bike for that price and I don't know what I have to ask to the owner to guarantee at least minimum chances of a old bike with alot of money to invest in repairs...