If you're on a thrifty mission, this Monki Tank will fit the bill. It's a popular choice, while not very expensive. Another good option is this Tank. It's a product you'll fall in love with which also won't break the bank. You may also want to look at this Asos Tank. This item is not expensive either, but it will make a difference in your wardrobe.
If you're looking for a happy medium, consider buying this Cotton Citizen Tank. While the price is very reasonable, this product is an easy wardrobe update. It's also worth taking a look at this Tularosa Tank. This piece is ultra popular and, just as importantly, not very expensive. And do check out this Fendi Tank! It's a very popular item and good value for money.