As has been mentioned, Mobil special took its place in the line up. The only place I've ever seen special was target about five years ago, before they went to carrying shell products.
I've seen it at Big Lots. As I understand it was a standard recipe product for the quick lube places. I remember it being a straight Group 2 with a calcium based add pack vs Group 2/3 Blend with sodium based add pack of the consumer oils. I think I recall around around a 6.0 tbn. It was basically a 6,000 mi oil.
Before Special they sold Super (no numbers) and before that Drive Clean (no numbers) to that market if recall correctly.
I think those were Group 2, Group 1+/2 and Group 1+ in order but my memory is not what it once was.
I believe Special died with intro of SN+ but it might of been SN.