They might not be in the catalogs but there are still a lot of wheels coming out, or making it to some skate shops that people are asking for, but I guess it is down to what you are looking for and checking with whatever shop you want to support, ordering or asking them to get them in for you.
If you are more just a find them online and or buy them when on sale, no worries, but I think most wheel options are around, but a lot sell out quickly or are harder to find if you don't search high and low or go to each specific shop site, which all up can be a pain to do and takes a lot longer than most people would want to spend on the whole process.
As far as smaller sizes, try the "Lil Smokies" which are the 49, 50, 51 mm versions of all the usual shapes in F4 wheels in both 99 and 101 and have a single black graphic, usually at a discounted price too, but some shops have them at the same price as all the other Spitfire F4 wheels.
I saw some shops in AU just got a whole lot more of them, so they are out there - just not in any listings, catalogs or official releases it seems.
Just looking through some shop accounts and there are more of the Radial Slim wheels out, as had been said by XEN and others recently.
They might be a good alternative if anyone wants a small slim wheel.