There are quite a lot of alternatives. It depends on you, which sax (A, T, S,

what type of sax etc, You have to put a fair amount of work in before the harmonics come easily (I've not put enough work in yet).
The fingering for G that works for me on tenor is LH: OK, 1, G# RH: top F# key
The A above that is LH: OK, 2, 3
I can't get the G# in between though.
Look at www.wfg.woodwind.org for lots of alternatives