If you're not planning on spending much, your best bet is this J.Crew Cardigan. It's a great piece, while not very expensive. Another good option is this J.Crew Sweater. While the price is rather reasonable, be sure that this item will become a valuable addition to your wardrobe.
If you're looking for a happy medium, you're in luck with this J.Crew Turtleneck in stock and waiting for you. You most certainly will fall in love with this item. It is also worth looking at this J.Crew Oversized Sweater. It's an attractive option both price and quality-wise.
If you're not the one to skimp on clothes, then you absolutely must check out this J.Crew Hoodie. This piece seems pricey, but it's worth it. Another product we're drooling over is this J.Crew Shrug. It's pricey but you get what you pay for.