All skin codes do not work anymore and any 'remaining ones' you may have heard of have all been disabled. This has been confirmed with riot, If you need further proof all you need to do is use google. Be careful of anyone who claims that they do have a code because they probably don't. There's a reason why you don't see 'skin code' sellers here anymore and it is because they were all disabled by riot.
proof:
(less than 10€ if possible.)
