Hi @eldhosepaul2008,
Thank you for your question and welcome to the Bunnings Workshop community, it is fantastic to have you with us.
The cheapest way to replace your cupboard doors is to grab some CUSTOMpine Particleboard, cut it to size and then use White Iron-on Melamine Edge on the cut edges. You'll then have to transfer the hinges and handles over before reattaching them.
There are also premade doors from Kaboodle that are a good option.
Let me know what you think and if you have any further questions, please don't hesitate to ask.
Jacob
