I think once you get past size 12 you become limited to Daytona and Oxtar. I can’t comment on the Oxtars, but I’ve got a pair of size 14 Daytonas, and they’re very comfortable - and gore-tex lined too… With the LB discount at Infinity, they should fit your budget mate
www.footlocker.com, a great source for us big foots, means waiting a few weeks for delivery from the states. They have a few +sizes in Nike, Reebok and others.