Stealing from town shops is not without dangers, those shop keepers do not want their goods purloined! If an NPC is nearby, and looking towards you, cultivate the patience to wait until they move away or turn their back. Failure to do so may result in your waiting for the crimnal flag to expire before the local healer will resurrect you. You will have been guardwhacked
Of course some NPCs will not move, most notably quest NPCs awaiting an escort. The easiest way to remove these from the area is to either take them to where they wish to go, or less kindly, to take their quest and then abandon it.
In addition to the stealable minor rares listed below you will find in some shops items used in Armor Refinement. These too may be stolen.