One of the most desired 165/70/10 tires is the Yokahama A008. It's my understanding from another message board that while they are not obsolete, they are not currently in production. When I last looked, Tire Rack was out of stock. For a while Seven was advertising that they had them. Of course, you could also check Mini Mania.
It's in your best interest to avoid tubes. You should only need them if the flanges on your rims (where the tire bead sits) are damaged or rusty. Using tubes in tubeless rims is a good way to insure that from then on you'll have to use tubes. If you must use tubes, contact one of the racing tire suppliers. They may be the only place you'll find performance 10" tubes suitable for radial tires.