You can buy Litecoin here:
I personally feel very bullish on Litecoin going into 2018. I know that Charlie Lee has stated there will be a huge partnership announcement in the early part of this year, with no specifics about who and when mentioned yet.
It should not take too long for Litecoin to revisit its previous All Time High, so if you are looking for a tried and true altcoin worth HODLing in 2018. this is one of my personal favorites.
Many people consider Litecoin to be thw Silver to Bitcoin (being the Gold Standard of Cryptocurrency).