Dark Green Turtlenecks from J.Crew
If you're on a thrifty mission, this J.Crew Turtleneck will fit the bill. It's a popular choice, while not very expensive. In this price range, you can also consider this J.Crew Rollneck. It's also a popular item and won't break the bank.
If you're a bargain shopper, we recommend taking a look at this J.Crew Turtleneck. While the price is very reasonable, this piece is an easy wardrobe update.