▲根据英语惯用法，两个意义相同或相对的名词构成的平行结构前不用冠词。

eg：day and night 日夜/ fac to face 面对面

day by day一天天/ husband and wife 夫妻

We are mother and daughter.我们是母女俩。

She has neither brother nor sister. 他没有兄弟姐妹。

Man or boy,I don’t like him.无论大男人还是小男孩，我都不喜欢。

▲因此，你举的例子froma shop to a shop/ from the shop to the shop 都是不宜使用的。

不过from shopsto shops 可以接受：

You can just sit before your computerinstead of going from shops to shops to see the items.