How to find horizontal patterned fabric for upholstered headboard?

I'm looking to make an upholstered headboard for a california king bed (72" wide). I want to use a pattern, but all of the fabrics I see are 54" wide at the most. I don't want a seam down the middle, and I want to use a print....how can I find fabric with a pattern that runs in the opposite direction? Thanks so much!