What can you offer?

A friend asked me a question, which I can't answer. Is there a single word in English for «the one who offers»? (like המציע in Hebrew) Sample usage: "-Someone here offers to buy our car for 10K NIS. -Tell the one who offers we're not interested". There is the word «offerer», but it seems outdated...

Brainteasers.

http://www.simplecodeworks.com/mazito
No cheating!