If you're big on brands, try MyHabit.com.
I'd say they are a tier above JackThreads because all their Items are name brands that you probably have heard of.
Amazon handles all their distribution as well, so if you have a PRIME account, that will factor into your shipping.
Also try Gilt.com. They are a tier above MyHabit, but follow the same concept. Name brands but discounted.
Sign up for their daily emails as the sales often change from day-to-day.