I don't know if they will have it, but I would try American Plant Products (405) 787-4833

Thanks so much! I'll call them tomorrow.

Maybe call John Deere, I think they are on Memorial Rd in Edmond. They are usually to the trade only but might be willing to point you in the right direction.

Thanks again, All:

I ended up calling both places--American had 6-inch but only sold wholesale; Deere wasn't sure what to rec other than TLC. Looks like I'll have to go through a professional landscaper.

For what it's worth, I wanted 12" wide strips to attempt to contain some raspberries. I ended up purchasing big sheets of corrugated metal (generic roofing stuff) and cut it up. As long as you're careful with the raw edges, it seems to be a pretty workable solution, and a lot less expensive than the "official" edging.