Wood material suppliers

Hey all- I’m very interested in wood engravings. The question has come up- how does one find a good hardwood vendor?

I’m thinking of redoing my cabinets with custom engravings and I’m worried that plywood will look tacky, so I was hoping to find hardwood panels around 24" x 18" x .5+"

Cost isn’t a huge factor- just wondering if anyone had a beat on this already.