If you're looking for an affordable item, your best bet is this Open Cardigan. It's a wonderful product, while not very expensive. Another strong contender for your wardrobe is this Cardigan. While the price of this product is not too high, it will certainly attract a lot of attention.
If you're looking for something in between pricewise, look no further than this Kimono. This item doesn't cost the earth, but definitely deserves a place in your wardrobe. Also take a look at this Current/Elliott Kimono. It's an attractive option both price and quality-wise. And do check out this Acne Studios Open Cardigan! It's a very popular item and good value for money.