Hi there, why not start your own store?
Resource: Teacher Author Invoice Template.
Are you doing some part time work on the side?
Perhaps blogging online or creating content for other educators.
This is the document for you. An easy way to communicate with your employer to request funds for services rendered.
I have used this when blogging for educational sites as well as promotional work.
Simply fill in and email to your employer. It helps you track what is owed as a professional contractor.
Further this document is a formal record for tax purposes.