With ATT USA, we are now paying US$30 for 120 megs of EU (and many other countries) data"
AT&T International - Wireless from AT&T
With Verizon, it is US$25 for 100 megs of EU (and many other countries) data:
Global Data
Voice is still more expensive, but you'd think that Orange (France Telecom & TMobile) could offer cheaper data packages for France and Germany than a US carrier could.