They're out there an available. Prices range anywhere from 15K to 150K depending on what you want. I think an average price would be 35 to 45 for a basic driver with everything looking and working as it should.They're priced at least 50% more than a 113 in similar condition. They made half as many so that factors into it.
You can get most of the parts you want but some are NLA and others will be soon. The club has a fair selection of book store items that makes restoring 190 far easier as far as understanding how it's done but you still need deep pockets.
These aren't some cheap little 4 banger like they once were. When I started back in the late 70's you could buy a nice example for under 10K. That same car would be 50K now.
Dan Caron's
SL Barn
benzbarn@ebtech.net
slbarn.mbz.org
1 877 661 6061