AT&T's enterprise offering for iPhone: 50mb international data for $60
Link: MacNN | AT&T adds iPhone to enterprise plans
For international travel, customers have the option of two Data Global Add-On plans: $25 allows 20MB of use before overage, while $60 grants 50MB. In each case, the package only covers 29 countries, including Canada, China, Germany and the United Kingdom.
I’m assuming, I think, rightly, that this means $60 for 50mb of data per month. That is reasonable. More at AT&T’s site.