How much is Obamacare?

ObamaCare (or, more properly, the PPACA) is not a insurance coverage plan. It is a legal regulatory framework concerned with making substantial changes to both the government-sponsored health plans (Medicare/Medicaid) and the private insurance plan market.

Thus, you can't "buy Obamacare".

In terms of the economic impact of the law, that's a complete unknown at this point. The law and changes are complex and far-reaching, and we won't have even a basic sense of the economic result until 2018 at the very earliest.