If you're budget-restricted, why not consider this ASOS DESIGN Tank. It's a fantastic piece for a good price. You might also want to consider this ASOS 4505 Tank. It's an item you're bound to love which also doesn't cost the earth. You might also want to consider this Esprit Tank. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're a bargain hunter, look no further than this Ted Baker Tank. This item won't break the bank, but absolutely indispensable in your wardrobe. You might also want to consider this Crooks & Castles Tank. It's an attractive option both price and quality-wise. And do check out this Wood Wood Tank! It's a very popular item and good value for money.