Hi hubrenton, welcome to LoL discussion!
This section is used to discuss league, and not for trading : ) we have a league blackmarket section if you look for it on the front page.
If you cant find the skins you are looking for, perhaps buy an account? Sellerman is selling an account with rare skins not quite the skins you are looking for but some more rare http://www.sythe.org/lol-accounts/1783356-pax-tf-sivir-jax-selling-best-lol-account-mod.html
As others have said, skin codes don't work anymore.
However, I suggest you be on the look out after Riot events as they give out codes with an expiration date.