Do they sell packaging there? I'm trying to ship two t-shirts and I don't really know the best way to ship besides a poly bag which I don't have. Thanks!

Yes, they'll package it for you for a small fee.

Yes and they do a very good job.

Yes! They will provide the packaging materials and package your items for you, right then and there, or give you a price quote - whichever you prefer. They will also provide pricing of all available options (USPS, FEDEX, UPS, etc.) so you can choose what's best for you.