What can I buy at panda express for $2.07?

I was looking at my credit card statement, and I was puzzled by the fact that I have a charge from panda express for $2.07. It was about a month ago so I find it natural to have no recollection of the transaction, but was curious what could possibly be that cheap, making me suspicious that I didn't actually make this purchase. Any ideas? I wouldn't have bought a drink, because the panda I go to is very close to a convenience store with more selection.