妈妈的双买鞋子(The whole article is talking about getting shoes, not describing the shoes)

爸爸：它们这个太贵了！
妈妈：它们便宜！(if you don't want have a argument with him/her , don't say this.But if you are controlling the money, never mind what I have said.)老板，这双鞋子多少吗钱？(If you ask the price ,"how much" need to be translated as "多少钱" instead of "多少".)
老板：六十五钱元。(The unit of RMB is "元" or "圆" or "块")→(1RMB = 1元/1圆/1块; 0.1RMB = 1角/1毛; 0.01RMB = 1分;)
爸爸：太贵了，便宜点。行吗？(Don't ask them "行吗?/可以吗?", if you want to cut the price.)
老板：你给六十吧？(They would not ask you if the price is OK or not.)
妈妈：好！好！
爸爸：不好！对不起，五十, 不行就算了!(Fifty ,or we are going home!)(Don't be cower.)
老板：好吧。
爸爸：谢谢，再见！(It will be rude and unusual to say "再见", you can say "我们下次再来(We will come around again)" instead after deal is done.)
妈妈：谢谢！
爸爸：不用谢。

It's stupid but I have no other way of practicing the vocab!

妈妈买双鞋

妈妈的一双鞋子