Interesting. There's only a few samples there at the moment, but they'll probably have more when and if business picks up. The style is quite interesting -- it certainly is oil paint, but rather than going realistic, it seems like it's designed more to mimic the actual look of the game, with a few weird polygon angles and designs.
Unfortunately, there's no mention of price at all (you have to email them for estimates), but odds are it isn't cheap. Then again, if you're in search of a one-of-a-kind oil portrait of the character you've sunk so much time into, this just might be worth the money you put into it.