"I am a convert to the Road 3"
You must live in a cold place. In warmer climes, the Road 3 was an absolute disaster. That's why it was superceded by the Road 4 so quickly, it was a matter of months here in Oz.
Personally, I'm still using Road 2 and yes they are still available. Maybe not as good in the wet as the 4 but heaps more grip on hot Ozzy roads.
I had original Road Attacks on my 04 Blackbird, probably not as good as the RA4s, but heaps better than the Dunlop D205' it came with