Around the World

Hello,
I am planning a future trip to Europe and I am about to the point where my current phone is dying out on me. I have Sprint service and do not plan on changing providers. Can anyone help me figure out the best way to have phone service in Europe for a couple weeks without going broke on charges? Should I upgrade to a certain phone on Sprint? Is the Blu Phone the way to go? Is there another option?

Thanks in advance for any valid suggestions.