In advertisements, ~ is used after a price to indicate that the person who is selling something is willing to accept slightly less money than the sum they have mentioned. ~ is a written abbreviation for ‘or near offer’. (BRIT)
O.N.O.
Meaning of O.N.O. in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012