The only Twilight Chess set that I know of is this one, which doesn't even have the series name printed anywhere on it:
http://gifts.barnesandnoble.com/Toys-games/Red-White-Competition-Chess-Set/e/9781932188141
You would be better off purchasing a red & white set from either Wholesale Chess, or the US Chess Federation (with a nice board to go with them).
A red and white Staunton style set, an interesting idea! I was looking for a more personalized set though where, for example, Bella would be the queen, Edward the king, ect.
You might have better luck around the twilight forums, remember that chess players tend to stick to staunton style sets because they are more widely available, they start at a lower price, and it's less diffucult to confuse the pieces. In addition, people have used staunton sets for so long the pieces have grown on them (not that they were ugly to begin with).
Finally, there is a Vampire vs. Werewolf chess set, too bad the close-up is still too small to see the pieces clearly:
http://www.yourtwilightgames.com/twilight-chess.html
Possibly the set Niven42 mentioned, but then the pieces look too well made. Looks like a custom set.
Could be a HOS Collector, but hard to tell.
Finally, there is a Vampire vs. Werewolf chess set, too bad the close-up is still too small to see the pieces clearly:
I've actually played with this set; the bishops and knights look similar enough to cause major blunders on both sides of the board, even if you're used to playing with it. Exactly the sort of thing to make you swear by Staunton sets.
Does anyone know if there is a chess set with "Twilight" characters as pieces available on the market? I googled, but to no avail...