Bountiful Gardens is closing their sales operation as of Dec 31, 2017. They say they already packed 2018 seed before the decision was made. They are offering 15% off all seed and 20% off all books and DVDs; the discounts show directly on their website
https://www.bountifulgardens.org/
(They also have posted a message saying they are getting a lot of orders because of their clearance sale so things are going quickly).