Another wood that looks like teak, seems to act and behave like teak is commonally called Iron wood. You might be able to find this at a local lumber yard vs teak. They look similar.
You will have to let your fingers do the walking in the yellow pages. Seems like any major city like a chicago, Seattle where I am , Vancouver where Brian is, seems to have one lumberyard that carries teak in a decent supply, then a few others with odds and ends, and a nice supply when the boat comes in.
She drives me boat,
I drives me dinghy!