Yes, inside and outside labels are $2.50 per shirt. For either type, the maximum print area is 3x3 inches.
Inside labels are available for select American Apparel, Alternative, Next Level, and Anvil brand t-shirts with a removable "tear-away" label. See your options here.
Outside labels are available for all other brand t-shirts (except racerbacks) that don't have a removable "tearaway" label.
When you submit an order or sync a product, you'll see the option to upload an inside or outside label print file, depending on the shirt model. You can view print file guidelines for labels here.