Do they sell postage stamps

Yes

Yes, they sell postage stamps, either at money services or customer service department.

I did ask if they did. Unfortunately, the sell them in increments of like 10 or 20. If u only need one, try one of the ups stores or one the small convenience stores. You'll pay close to a dollar for them though. When are you going to need a stamp again though? If you do go for the book, they are forever stamps...