I probably described it poorly, but both of those services are $/month for access to a full catalog that Netflix/Amazon manages and curates.

That's not really a marketplace, which would have individual vendors selling their own subscription bundles.

Officially there is no such service, but unofficially you can do a lot of stuff :-)

You pay $12 to Netflix and you can watch it officially on 4 devices, which means it's $3 for any of your 4 friends, but you can "oversell" it actually more if you've some friends in different timezones. Many services work this way just fine. Streamwarez(tm) is here for a long time already.