Hi, I just got into this game by buying a bunch of cards second-hand. It included the cards from three core sets but was missing all of the faction cards and tokens. I’ve looked on eBay but only found the faction cards available from Australia. Does anyone know a website that sells singles? Any other places I should try?

Singles are not commonly sold for LCGs in general, but some players have alternate-art house cards they may be willing to let go of for money. Nobody resells the cardboard tokens either, but at least using official tokens don't matter as long as they are clearly differentiated and don't overly obscure cards.

I just ordered over 130 cards from Born to Play Games website, They don't have everything but they have quite a bit.

They also have a Titles and Tokens bundle for around $3 if I remember correctly.

http://www.borntoplaygames.com/catalog/game_of_thrones_2e_lcg_singles/1343