If you're in a thrifty mode, your best bet is this Amour Vert Tank. It's a terrific piece, while not very pricey. In this price range, you can also take a look at this Free People Tank. It's a product you'll fall in love with which also won't break the bank. You might also want to consider this Hinge Tank. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
For something in the middle of the price range, we've got your back with this James Perse Tank. This piece is bound to become a total wardrobe staple. You might also want to look at this Neiman Marcus Tank. It's an attractive option both price and quality-wise. And do check out this Halston Tank! It's a very popular item and good value for money.