I shop at Jackthreads from time to time. Sometimes they have deals that you just can't miss out on. Another site you might want to check out is plndr even though they tend to be more streetwear oriented.
I've found that jackthreads is like gilt (daily emails tipping you off to clothing deals) but more attuned to the typical 20-something male. Prices are much more down-to-earth as well as the overall style not being as chic/euro.
JackThreads is owned by Thrillist, and offers some great deals on men's fashion items. The site is simple and the pictures on it are big, which results in a good user experience. I actually enjoy looking through the items in a way I don't on most fashion sites.