As far as I know: Astrox 99 has 69 as cheaper and 39 as cheapest version. Astrox 88S/D has 68S/D as cheaper and 38S/D as cheapest. With same logic, Astrox 100 should have 70 as cheaper and 40 as cheapest (if they are available). Astrox 100ZZ and 100ZX are more like twins (like 88S and 88D) (both have Namd), new siblings to AX99, 88 family. Don't expect Namd in cheap version.