there was actually a post on their blog about that posted shortly after the speakers went on sale, it was a typo at first:
Hey! We screwed up tonight on our pricing. Two people were editing the page at the same time and the wrong price was entered. It was supposed to be $29.99 for this item. For those who have already ordered, you will be receiving a refund check with your order.
Happy days are here again at Tanga!