I think the best way to find cases is to search on ebay Juste type "P990 case", there is two pages
any armband sport for iphone4/4S will fit perfectly to O2X.
Hit your nearby apple store and see for yourself
I borrowed my friends apple "gym case" a while ago, and it worked nicely
Sent from my Optimus 2X using xda premium
I'm currently using an ipod gym case but its really tight and sticks out about an inch.