If you are on a limited budget, your best bet is this Forever 21 Tank. It's a wonderful piece, while not very expensive. It is also worth considering this Tank. It's an item you'll fall in love with which also won't break the bank. Or you can choose this Chaser Tank - be sure you'll be making a stylish addition to your wardrobe.
If you're on a hunt for a luxury item, then what you're looking for is this Marni Tank. It's more expensive but worth your money. While you're at it, also have a look at this Courreges Tank. Yes, this item is expensive, but it does not mean it's not worth it.