Yes. The QX SA and AF SA are basically ‘budget-decent’ spherical-ish keycaps, with the latter being shorter than SA.
The thread that was mentioned is very helpful in this context.
QX SA is on the bottom-end of ‘decent,’ and can be found for about $23 CAD sometimes. I am not sure about the keycap consistency, and the profile doesn’t work well for me. But the colour is reasonably consistent, and they don’t seem to ship with many errors. Well-packed for the price.
There isn’t too much diversity in colourways for QX SA. They probably did a few runs of this and that, and decided that not enough people were buying it. They are a far sight better than what used to retail at the price, but they are not in a common profile.
AF SA is nicer. I think the keycaps themselves are a little smoother, more consistent, very consistent colour. But the sound is mediocre - MT3 and SA will give you better sound, if that’s what you’re looking for. Tend to be packed very-well for the price.
AF SA is basically a shortened MG profile, I think. MG was ‘inspired’ by Topre Hi-Profile, some people suspect. MG is actually very nice to type on, but has the same mediocre sound as AF SA.
Then there is actual Maxkey SA. Where they actually copied SA profile. I think I’ve come across at least one of these sets. The sets that actually clone SA are pretty decent, just not as luxurious in sound or finish as real SP SA.
The problem is that some vendors on AliExpress, and probably elsewhere, label some sets as ‘SA’ when they are actually AF SA or QX SA, which causes confusion. So if you are looking for real Maxkey SA, make sure the product photos by the manufacturer clearly state that it is SA-profile, preferably with a diagram of the profile.
Otherwise, the Maxkey SA that is bundled with budget keyboards on AliExpress tends to be fairly nice.