If you're not planning on spending much, your best bet is this J.Crew Full Skirt. It's a wonderful product, while not very expensive. Another wonderful option is this J.Crew Pencil Skirt. While the price is not too high, be sure that this item will become a wonderful addition to your wardrobe.
If you can afford to spend a little more, consider choosing this J.Crew Maxi Skirt. While the price is very reasonable, this item is an easy wardrobe update. You might also want to look at this J.Crew Midi Skirt. It's an attractive option both price and quality-wise.