Thom Browne in New York? Cheap places to shop?

I'm going to head to New York from Korea soon. I've been there a couple of times and went to different stores in Manhattan, also going to Woodbury mall whenever I had the chance. I found Woodbury mall to be cheaper, but my friends are telling that it's dirty expensive there. Are there cheaper places to buy clothes like Hugo Boss, Burberry, Tom Ford, etc. From somewhere other than Woodbury? Or would Woodbury be my best bet?

Also this Thom Browne sweater is 30% off right now; will I be able to find a better deal in New York than this price?

https://www.ssense.com/men/product/thom_browne/heather-grey-racer-stripe-sweater/93214

Check out the Manhattan Mall.
http://www.manhattanmallny.com/index.aspx

Here's a guide to some of the less expensive clothing stores,
http://www.nyctourist.com/outlet-stores-ny