Shop with the following merchants for mens size 16 shoes:

Zappos Mens Size 16

Zappos features over 900 pairs of mens size 16 shoes, from athletic shoes to dress shoes, from Allen Edmonds, Ugg, Cole Haan, and many more name brands.
Free Shipping & Free Return Shipping, so order several and keep the ones you like.

Macy's icon

Macy's features size 16 mens shoes from Sperry, Dockers, Calvin Klein, Johnston and Murphy, and more.
Extra 30% off at Macy's VIP Sale with code VIP, plus 15% off Beauty. See website for details. Valid 9/16-9/24.

Nordstrom features over 150 pairs of name brand shoes in mens size 16, from designer brands to casual shoes.