Google's Nexus 7 with an unlocked HSPA+ data option ships tomorrow. I find myself wondering, though, how useful this will really be for data roaming worldwide. How many carriers are selling (at stores, kiosks, airports...not by mail) pay-as-you-go data *Micro-SIM* cards?

I realize there may be some overlap with the master thread on data, but this question to the Flyertalk collective is specific to Micro SIM...

I'd appreciate it if folks from different locations could report here about Micro SIM availability...

Thanks!