If you don’t want to splurge, your best bet is this Morning Warrior Tank. It's a terrific item, while not very costly. Another wonderful option is this LOFT Tank. While the price is rather reasonable, be sure that this piece will become an excellent addition to your wardrobe. You may also want to look at this Paige Tank. This item is not expensive either, but it will make a difference in your wardrobe.
If you're looking for something in between pricewise, consider this Joie Tank. While the price is very reasonable, this piece is an easy wardrobe update. You might also be interested in this Lauren Moshi Tank. It's an attractive option both price and quality-wise. Alternatively, opting for this Kelly Wearstler Tank is a smart choice as well!
If you want to treat yourself, then you absolutely must check out this Stella McCartney Tank. This item seems pricey, but it's worth it.