If you're on a thrifty budget, this Hinge Tank will fit the bill. It's a popular choice, while not very costly. Another strong contender for your wardrobe is this Yummie by Heather Thomson Tank. While the price of this piece is rather reasonable, it will surely attract a lot of attention. You might also want to consider this Halogen Tank. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're looking for a bargain, look no further than this Ted Baker Tank. This item won't break the bank, but absolutely deserves a spot in your wardrobe. It's also worth looking at this Paige Tank. This product is extremely popular and, just as importantly, not too pricey. Take a look at this Helmut Lang Tank too! Great value for your money.