if you're in a thrifty mood, this Neiman Marcus Turtleneck will fit the bill. It's a great choice, while not very costly. Another strong contender for your wardrobe is this Wolford Rollneck. While the price of this item is rather reasonable, it will certainly attract a lot of attention.
If you're looking for a good deal, look no further than this Rag & Bone Turtleneck. This item doesn't cost the earth, but absolutely deserves a spot in your wardrobe. You might also want to take a look at this J.Crew Turtleneck. It's an attractive option both price and quality-wise. And do check out this Acne Studios Turtleneck! It's a very popular item and good value for money.