Salman,
Under the new CRRS, there should be no limit (at least to my understanding) to obtaining PDUs by listening to podcasts or webinars. Alternate PDU methods are varied: you can attend local PMI chapter meetings, give presentations, go to conferences, read books/PMI journal articles, etc. There are lots of ways you can fulfill your requirement, though you will need to get on the ball now to get all of your required hours in before June.
- Steven