Living Social is offering $40 to spend at Saks Fifth Avenue OFF 5th for only $15 using promo code: FALL13 (This promo code expires September 4, 2013 at 11:59PM PST). The voucher itself does not expire until November 5, 2013, so you have at least 2 months to take advantage of this huge discount! Even if your voucher expires, the paid value does not expire! This means that if you do not use your coupon in time, the voucher does not become useless. It is worth the amount you paid for, $20, just the promotional value of it expires.
Once you buy this deal, make sure to use your $40 credit before November 5, 2013 before it loses its promotional value!
Also, after you buy any Living Social deal, get three of your friends to buy from your referral link and get your deal completely free!