If you're looking for an affordable item, this Tank will fit the bill. It's a popular choice, while not very expensive. Another strong contender for your wardrobe is this Alo Yoga Tank. While the price of this product is rather reasonable, it will certainly attract a lot of attention. You might also want to consider this Vince Tank. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you can afford to spend a little more, you're in luck with this Helmut Lang Tank in stock and waiting for you. You are bound to fall in love with this piece. Why not also take a look at this Misook Tank. It's an attractive option both price and quality-wise. And do check out this Haute Hippie Tank! It's a very popular item and good value for money.