The Knot is having their biggest sale of the year now through Wednesday (April 21st). You can save up to 75% off plus you can combine that with coupons. The coupons are:
KSAPR3D15 to get 15% off an order of $100 or more
KSAPR3D20 to get 20% off an order of $175 or more
If you spent $161 then go ahead and throw something in to get to the $175 mark. The cost will be the same since you get a higher coupon code for $175 and above.