There is an interesting flame war happening on the Riot-ACT regarding the Salvos Store at Mitchell.
It does raise some interesting points about op-shops running on a commercial basis, and charging a standard price across a region, but hey, they have to pay rent and some staff salaries. Also in a City a mobile as Canberra it is not uncommon for dedicated op-shoppers to visit the op-shops on the other side of town (lord knows, I have done this often enough). If I felt a particular op-shop was cheaper then all the rest, I would make a point of visiting more often.
Anyway for little bit of light reading, check it out