Chris, I don't think either the East German camo synthetic for the Yugo, or the black synthetic sporter are available now in 2013.
Stuff waxes and wanes with the availability of a given type of rifle. (I'm not counting Tapco, aka, "Crapco" - something tells me they'll always be pushing stuff out the door.)
When the Yugo SKS variants were coming in hot and heavy, there were all sorts of stocks sold to fit them.
That sporter synthetic stock for my benchrest SKS was an easy find at the time all those Norincos were getting imported, too.
I don't like bullpup conversions because all of the ones I handled/fired had the most Gawd-awful triggers, thanks to the linkage and associated monkey motion.