I occasionally will pick at retail shops however for the most part there's a reason items are marked down. Just for example go to a discount book store and often times you'll find some pretty decent titles for a buck and I"ll think I could probably resell these but when I investigate on amazon or something there's like 100 other people selling the book for a penny so obviously it was overprinted and there's a ton of surplus.
I find oftentimes its the same situation at Ross, Gordmans, Marshals, etc. I have two stores near me I love for picking one is called bargains in a box. It's like a dollar store but they get like surplus and unsold stuff form costco and decent stores so you can find coffee french press for $5 that go retail for $20 or $30, cheap toaster ovens, laptop cases for $4 that go for like $20. Another store I really like is called Forman Mills. What Marhsals would sell for $15 they sell for $4. I just got a brand new members only jacket for $20 those sell pretty good kinda a resurchance in that as a style, non branded nice fleeces for like $6, etc. They also have plenty of brand names though.