游泳鼻夾......10點

I think you can buy it from most sport shops (shops that sells sports equipment, or shops that sells sporty wear)
but if you still cant find any, there is a shop that sells sport equipment in new city plaza in shatin,
or you can go to the one in sunshine city plaza in ma on shan (this one 100% has it ) this one is solely selling sport equipment and have goggles and 鼻夾.

馬拉松,運動家,置樂,新墟,先施,運動店.................