Month to month plans and international traveling

I'm a big fan of no contract cell phone plans and I'm currently on the T-mobile $30 one. My issue is I travel internationally a lot and there is no roaming on any of the services I trust (AIO, Straight Talk, T-mobile). This hasn't been an issue as I use to travel with co-workers but now I'll be doing a lot of solo travel. Any good ideas on how to handle this? Are there any month to month or pre-paid plans with international roaming?

Most of my time is in Taiwan but I go lots of other places. Since I'm not in sales my company does not help with my phone bill. I'd rather not spend $90 a month on a cell plain when I'm out of the country a week or more every month.