ESP FLX is gone I do believe, but my Z FLX Zone is pretty new, not new enough to have 5 flight numbers, but I think they are still making them.
2 of them would probably be a lifetime supply. Hard to lose because you know what to expect out of the flight, and largely impervious to wear. :clap:
I have 2, pink for summer and lime green for winter. Both are the old flight numbers.