The most recent MassDrop Alps keycaps were nothing more than the Tai Hao sets you can get elsewhere (usually). They are thin ABS double-shot keycaps, which are better than thin ABS laser-etched keycaps granted, but really the only sets worth considering, IMO, are their Olivette and Dolch sets, for no other reason than they aren't all black or all white.
The only other Alps set I know of is Alpine Winter, and it is/was DCS. Maybe there have been GMK sets? I wouldn't know as I don't follow GMK group buys.
As far as I can tell, there has never been an Alps-stemmed spherical group buy (i.e., DSA). LightCycle was to be the first (that I know of), and now that is no more.
Your only other option is to harvest keycaps from vintage Alps boards.