Another option is contacting your local design school. Media Design School in Auckland or Yoobee have campuses around the country, or a local polytechnic or university. The schools often do ‘live’ projects. You can fill in a form to apply, you just may need to wait for the right timing. If you build up a good relationship with the student you could carry on working together as they graduate, helping them build their portfolio – and helping you with new design work that is needed.
Or another free option is to check out Canva.com. Find a theme you like and adapt it for your business.
All the best!