I imagine they were sold used, and then were cleaned up and possibly lightly sanded and refinished to get rid of any scratches or gouges.

They'll last forever, just like any aluminum wheel would. The quality of it depends on how good the company is. I've never heard of transwheel.com or aaarims, but then again I've never looked into it, either.

Another possible place you can look to is going onto EBay. It's likely they have Type-S rims for sale somewhere, they usually do.