If you're not planning on spending much, your best bet is this Joan Vass Tank. It's a fantastic item, while not very pricey. Another wonderful option is this Caroline Rose Tank. While the price is rather reasonable, be sure that this product will become a great addition to your wardrobe. You might also want to consider this Champion Tank. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're a bargain shopper, why not look at this Equipment Tank. While the price is very reasonable, this piece is an easy wardrobe update. Also look at this Misook Tank. It's an attractive option both price and quality-wise. Alternatively, opting for this Natori Tank is a savvy choice as well!
If you're gonna splurge, then you absolutely must check out this C/Meo Tank. This item seems costly, but it's worth it.