You can use the code LULUEMP2013 to buy books at 40% off on Lulu.
You can buy Majestic Wilderlands (in one of two covers) and Scourge of the Demon Wolf.
As well as OSR stuff along with Swords and Wizardry which the MW Supplement is based on. I personally recommend the Monster Book. Also have a look at back issues of Fight On!
Thanks to Tim of Gothridge Manor for pointing this out. And while you are on lulu look at his store.