Thrifty shoppers where do you shop on-line?

On-line shopping can be hit or miss in my book.  You have to know which brands fit you before purchasing on-line regardless of whether new or new to you.  Since I am a huge fan of digging, I prefer thrifting in brick and mortar stores.  That being said I have found a place that I truly LOVE to shop at LikeTwice  Liketwice is an on-line “consignment” store that you can purchase and sell selected brand name clothing at a fraction of the cost.  I just recently sold a handful of gently worn clothing pieces from that brief minute that I got down to a tiny size.  I had been hanging onto these lovely items for well over a year and frankly looking at them hanging in my closet was upsetting me.  I sent them off in a pre-paid bag and BAM I had a choice between a store credit or a check to be mailed to me.  Also, because I suggested the site to a good friend of mine who did purchase from the store I received a $10.00 credit from that as well.  If you sign up to use the site and invite friends to shop or consign (or both) you spread the word about this great on-line shop AND reap some fine clothing too.  Win Win in my book but like I said, I don't really like to shop on-line so don't really know to much about any other places like this.  Do you have a favorite on-line shop you visit often?  If so, please comment and link so I can check it out.