Knee Brace for super size knees!!

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Hello! I developed mild arthritis in my knees over the winter...likely due to excessive weight.

I am planning on going back to my knee specialist asap, however, until I can get in I really need to look for a knee brace. I'm wondering if anyone can point me in the correct direction, or if anyone has any thoughts on whether I should look for one on my own or wait until I see the doctor?

The bottom part of my thigh was around 32 inches with my calf being slightly smaller. My calf is mostly muscle, while my thigh has more fat.

I appreciate any assistance!