There was a bug in version 0.05.00 that prevented some players from having a second camera in the store.
Only 4 people reported such a problem, including me.
The first fix (0.05.01) fixed this problem.
As for the stepladder, no one had any problems with it.
Okay, I only had a problem because I was hoping to just find it by accident. However, it will be possible to find it during Mia's second visit, which will be included in the next version due to the developer's illness.
In general, if you really don't have a stepladder on sale, see if you have any fixes installed? That is, your version of the game should be either 0.05.01 or 0.05.02