I recommended this before, but I've had it awhile and I'm still happy with it so I'll recommend it again.
The Norcent DP-300 is cheap (currently $65 at Amazon), it has a voltage selector so you can travel, it has a PAL/NTSC converter which means you can definitely play any region-free DVDs wherever you are, and it is also generally fairly simple (punching in a code) to make Region-Free. The last part may change, as different firmware versions do come out so what works on one player may not work on another, but I had no problem with mine.
So, if you need to play DVDs internationally, or play international DVDs locally, or both, it's a very cheap solution.
Buy one here!
