Admin pages
The average web-based shop works like this: there’s a front and a back. The front is sexy, the back is not. One group of people goes to the front to buy stuff, other group goes to the back to manage that stuff. These groups of people intersect only when those who go to the back pretend they are buyers. But still, there’s a huge distinction.
On the other hand, the real shop also has a front and a back. But those who sell stuff do not stay in warehouse all day long turning knobs to rearrange stuff on shelves. They actually go to the shop room to put things in place, see how they look and how customers explore them. In other words, a physical shop is more WYSIWYG than a web-based one.
My suggestion is to outsource to warehouse pages as little functions as possible. The shop owner should have a control on what is presented to the people. He should be able to immediately update prices, titles, rearrange things and see some basic stats which help to decide how good something sells.