PetSmart has the best sale prices and warranties then my local LFS. The only downside is battling ick and quarantine is a must for a few weeks.
I did see first hand someone's returns going directly back into the main tank without even a glance.
The salesperson also told me they automatically dose QuickCure for 3 days when they are getting their stocks each week. I've never bought fish from them that didn't develop ick within two weeks. But I guess that's the price you pay!