Took advantage of this last week and bought myself a nice Ken Onion Tactical Blur for $35.  Solid deal imo.  Also works on multiple knives, e.g. get a pair of serrated Clash Speed Safes for about $36, 3 Tremors for about $41, etc.  Not sure when it expires, but probably fairly soon, so act quick if you want in.  No coupon or anything, just add the knives to your cart and confirm the promo is applied before submitting your order.