The tempeh is in the freezer section of the 99 Ranch I usually go to (Richmond). I haven't paid much attention to seitan, but I know it can be found in many varieties in cans/jars. I imagine they also have refrigerated and dried seitan, but can't vouch for it.
At Ranch 99 the wheat gluten products are usually near the tofu, but there are frozen items too. I don't remember about tempeh; I've usually bought that at WF. I go to Concord Ranch 99, but I've been in others and they seem pretty uniform.