Apple appears to be testing same-day delivery for some of its products in select markets for customers using the Apple Store app on iOS. First noticed by MacRumors, same-day shipping options fulfilled by the on-demand shipping service Postmates now appear for certain items when checking out with the app.

Not at all in-stock items qualify for the $19 flat rate same-day shipping option, however. The option doesn’t seem to be available within the Apple Store app for all markets with Apple Stores that Postmates serves, either, suggesting the same-day delivery option is being tested on a small scale for now.

Apple recently updated the Apple Store app for iOS, adding support for Touch ID to view order information and 2-step verification for added security. The update also highlighted availability in more countries around the world, but Postmates integration and same-day delivery options have not yet been officially announced.