If you are on a tight budget, your best bet is this Everlane Tank. It's a wonderful piece, while not very costly. Another great option is this AllSaints Tank. While the price is not too high, be sure that this piece will become an excellent addition to your wardrobe.
If you can afford to spend a little more, look no further than this Raey Tank. This item won't break the bank, but definitely deserves a place in your wardrobe. Also check out this Joseph Tank. It's an attractive option both price and quality-wise. Alternatively, opting for this Rag & Bone Tank is a good choice as well!
If you're looking to purchase a designer item, then what you're looking for is this Kacey Devlin Tank. It's more expensive but worth your money. While you're at it, also have a look at this 3.1 Phillip Lim Tank. Yes, this item is expensive, but it does not mean it's not worth it. And how about the luxurious Theory Tank? Yolo, right?