Have a look on Amazon. I got one for my phone (though it's a Samsung, not IPhone, but they do all sorts and makes) mine is a leather wallet style, with pouches for credit cards etc. Think it was about £11.99.
DGS would love to have my iPhone 5 when I get a new phone. Because he is disabled he needs a wallet type cover to house his disability information card/railcard etc. for when he travels to college. Any advice on a good quality case that is strong and will last gratefully accepted.