If you're on a thrifty mission, this Forever 21 Tank will fit the bill. It's a popular choice, while not very pricey. You can also take a look at this Tank. It's a product you're bound to love which also won't break the bank. You may also want to look at this Chaser Tank. This item is not expensive either, but it will make a difference in your wardrobe.
If you can afford to spend a little more, look no further than this 3.1 Phillip Lim Tank. This item doesn't cost too much, but absolutely deserves a spot in your wardrobe. It's also worth checking out this Etoile Isabel Marant Tank. This item is ultra popular and, just as importantly, not very expensive.
If you're not a thrifty type, why not take a look at this Marni Tank - a great luxury choice. 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.