Amazon is your friend. I have these as a size 13 and love them. You'll need to use the size chart to convert his size to the European size and then search Amazon for shoes that fit that size.

Louis Garneau Men's Ventilator 2 Cycling Shoes (White, 41 EU) https://www.amazon.com/dp/B00H6YCA24/ref=cm_sw_r_cp_api_hbe.BbJGH36KX