Welcome to the website AyshahPearson sorry to hear of the troubles, I know about debt and have been there myself! Still digging my way out of some of it, but am finally starting to save I hope you manage too!
I've had a quick look around, without knowing model or the brand of the oven it's a bit hard to do a lot of research try here:
Statewide Appliance Spares
This company have a lot of spares for popular brands: Save On Spares
and this one might be worth a look: Flagstaff Electrical Appliance Spares
A friend had a similar problem they rang the spare place and asked if they could recommended an electrician to check it and then fit the spare. That was in Melbourne and it all worked fine. My electric ring element on the stove top used to burn out a lot and a friend replaces it for me, they said my power fluctuated a lot and was a reason I was always blowing lightbulbs. Energy efficient LEDs have been better in my flat now.
I hope that has helped.