Buy High-Proof PDX FORTHCOMING Sept. 12, 2017. Pre-Order High-Proof PDX RETAILERS High-Proof PDX is available at these retailers in Portland. More coming soon! Contact Overcup Press if you would like to carry the book, or view more information here. Powell’s City of Books, 1005 W Burnside Street, 503.228.4651 Whole Foods, throughout the state of Oregon.