o.n.o.

剑桥词典

written abbreviation for or near(est) offer : used in advertisements for things that people are trying to sell to show that they will accept slightly less money than the price they are asking for
（用于广告中表示可以接受稍低的价格）或接近的价格，可还价（or near(est)的缩写）
Ladies' bike - excellent condition . £80 o.n.o. 女士车——性能良好。价格：80英镑，可议价。 返回 o.n.o.