I have a Cabana Kitchen
No, Mark, we at FixYa don't sell parts, or accessories. We simply provide information to questioners like you, on how to repair just about anything. And we also tell folks where to find the parts they're looking for.
In your case, the only place I have been able to find replacement parts for Cabana Kitchen grills. And even then, they want you to go through your local dealer (who you purchased it from) to order replacement parts. I suspect, the dealer may have the cooking grates and the Flame Tamers (the covers that go over the burners), in stock. If not, they should be readily available to them.
The other option is to measure your grill grates and flame tamers and search online for other manufacturer's who use the same dimensions or are very close. When you replace your grill grates, I highly recommend Stainless Steel and the same thing for the Flame Tamers. Yes, it cost a little bit more, but it's well worth it in the long run. I just did my own grill (which is very similar to Cabana Kitchens) that way. And I couldn't be happier.
Cabana Kitchens makes a great grill, but they're lousy about selling parts directly to the consumer. But, they're other companies that do the same thing (i.e. Vermont Castings, Rinnai, Dimplex, Traeger Grills, etc). Anyway, I hope I provided enough information to steer you in the right direction. Please let me know. Thanks.