Each level brings certain items to view and shifts the balance. Try to increase your level.
While I do see allot of shoes. Earlier in the levels it was Donuts. Then VU items. Then shoes.
I reached level 30, then it was overwhelmed with Electronic components.
I expect when I get higher there will be other items that overwhelm the market view.
Could be that different levels connect to different market servers or just the filters on them. I know as I reach higher, the lower items are harder and harder to acquire.
It really needs to be balanced better. it sure does demotivate me to increase levels. I had to set up another Tablet and ID, build another city and keep it at level 10 so I could access the lower level items easier and produce/trade between my main city and 'the annex' city.