Pre-Paid Sim GGK

[whatsthequestionnow]

Hi..

Heading to Jakarta shortly and wanted to grab a pre-paid sim and credit same as I do in Kuala Lumpur.

Can I grab one at the airport... where will I find them?
Which company is best?
How Much are they and are they easily re-charged?
Do vendors at airport accept Amex or cash only?

My telephone usage can be a little erratic but keen to not have one single cost $48 AUD call like it did last time when I roam with work mobile.

Thanks!

question?