For those of you that really work on your shops/keep them stocked, and are focused on one particular category, how do you do so? Either legit or illegit.

I'm going back to playing Neopets again after a super long period of 'log on. do dailies. I'm done' and I'm going to refocus on my shop, but it would be good to just get some pointers on how to keep shops stocked up decently.