Well, 212s cost the same, but you see them everywhere in the commercial market. I was thinking there would have been a commercial interest in the 60s as well, but i don't really know the capabilities of the aircraft, and maybe it's not as suited to as many commercial applications as it is to military ones. The 212 is kind of a big old flying Suburban.
Sikorsky hasn't pushed it. Obviously, Blackhawk is ITAR as hell. Their commercial helicopters are the S-92 (think Blackhawk on steroids) and the S-76, which is for posh executive transport mostly. S-92 is mostly for oil rigs, it's a flying school bus. Blackhawk is built for combat and has a lot of design features relating to it, it's expensive. Huey (Bell 212, as Ben said) is the choice for medium sized transport helicopters. There's also the Airbus H145 and AgustaWestland AW109.
Sikorsky is big, dumb, expensive and slow. It's riddled with bureaucracy and corporate theocracy of management fads. Eurocopter/Airbus isn't tied down by ITAR and anti-bribery laws, which gives them a lot of flexability. In addition, their government lobbies to get them international business a lot harder than the US government does for US companies. Augusta and Bell are the much smaller (but cheaper) companies for Europe and US. Obviously, beyond that you have regional players in Russia and China that roll their own helicopters. Korea and Japan build their own, but a lot are western designs that they license.