Traditional skins

Is there anyway i can get the Traditional skins, such as karma and lee???

Legacy Traditional skins (Trundle, Sejuani and Karma) are only available through Mystery Gifts or Boxes. However, Traditional Lee Sin is not Legacy, as far as I remember, therefore he's available in the shop.

Why did riot discontinue making traditional skins.

The reasoning behind this decision is that Traditional skins, while very cool, take some resources, like any other thing that requires an update, only these skins are not 'a must', technically, for Riot made them after updating the champs, and not before the update. The Traditional skins use of resources delayed the updates' release in quite a bit so they decided to just drop it with making them.

They also gave another reason, specifically relating to Sion's case - Sion's old voiceover didn't have fitting sounds and "lines" (Shouts and screams) for his updated kit _(Although I personally think that they could've put his two old _ laugh files on loop when he ults, which would not only work well, but would also fit with his goofy, old voiceover).

Never say never. They sometimes put legacy skins on sale for special events, so they could do the same with Traditional skins at some point.