@Chosen2018 I'm sorry that you didn't see the option to order additional readers, I don't know what happened there!

You can buy additional readers online anytime from the Square Shop.

You can also buy Square magstripe readers (with audio jack connection) from participating retail stores and the Square reader for Contactless and Chip is available in Apple Stores. Call ahead to make sure they are in stock! 

Keep in mind the readers are universal and don't have any account-specific information on them. When you receive a new reader all you need to do is connect it to your device and you're all set!