DEKANG does make VG; however, the batch mixtures generally have to be ordered by suppliers...it's not their default offering...
as far as 50ML VG - i'd hit up your favorite supplier and ask them if they can get it done for you...also let them know which % VG you like as there's also a variety of that too from 100% VG (which is too thick IMO) down to 50% VG...
I prefer 70% vg/30% PG as it seems the right mix of VG & has a good viscosity that doesn't seem to clog attys...