Is Obamacare available now

ObamaCare (the PPACA law) officially kicked in 1 Jan 2014.

Many provisions had already begun to be phased in (starting in 2012), but it is now possible to purchase insurance via a state or federal exchange, and possibly receive subsidies for that insurance. Likewise, most employers are now required to offer coverage and otherwise adhere to all the provisions of the PPACA.

There are specific "open enrollment" periods when an individual can purchase or change their healthcare coverage through the Exchanges. The current period runs through 31 March 2014. For 2015 and subsequent years, it runs 15 November through 15 January (2 months). You may only buy insurance outside those times if you have certain events (such as moving between states, birth/death/marriage, change in employer, etc.).