I could not find a Cobalt that had a turbo charger or supercharger, but now that Goblin 2 is coming out and VWs easier to find, may go that route.
Truth is: Donors will eventually run out.
I look for 07-09 Cobalt / clones (manual) every week or so on FB Market, searching for another donor when I return home next spring. I rarely search for SS models but still see probably 2 turbo and 4-6 S/C every week. (Some are pretty rough!) I am generally searching within 250 miles of Columbus, GA. but every month I widen the search for all US.
I see the most Cobalts from Texas north into Kansas, MO, into Ill, Ind, Ohio to Penn, south into Ky and Tenn, tapering off going south from there. Phoenix seems to be a hot spot. There are usually donors for sale in the classifieds section on this forum.
Also the Pontiac G5 is a donor, but I am not sure they made a S/C or Turbo or 2.4 N/A auto version, badge engineered cousin, mostly body styling differences. HHR SS and Saturn Ion Redline's can be "driveline donors" but have completely different electrical systems. Many HHR SS are automatic.
MORE Boring/Blatant Opinion Follows:
In three months on our NZ/OZ vacation, I only saw one Cobalt(an SS at a car show, it was stock US spec{not RHD} and it attracted a mob. Duh, it was red.) but they were never sold there.(In OZ I rented a Golf called a "T Cross", it didn't seem like a Golf to me.)
Cobalts were not offered in EU GM dealers to my knowledge.(We moved from Brussels to US in 05) Plenty of VW Golfs(or whatever they call it now) available in Europe.
IF you actually want more Cobalt info PM me so we don't bother everyone.