If you're after a thrifty option, your best bet is this Barbour Tank. It's a popular piece, while not very costly. Another nice option is this LnA Tank. While the price is not very high, be sure that this item will become a wonderful addition to your wardrobe. You might also want to consider this Full Tilt Tank. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're a bargain hunter, why not take a look at this Cooper & Ella Tank. While the price is very reasonable, this product is an easy wardrobe update. It's also worth considering this Alexander Wang Tank. This piece is ultra popular and, just as importantly, not too pricey. Alternatively, opting for this Nobrand Tank is a great choice as well!