I haven't paid attention lately, but 2-3 years ago Bowser still had stock of many of the road names. (for sure the airslides, not 100% up on the others but I believe they had at least a few.)
I have 7-8 of the airslides in my project pile awaiting body mount couplers, etched details, and new trucks. I wouldn't mind seeing new tooling, but not at the expense of some other models I would rather see.