We live in Japan and in addition to a new laptop, I'm looking to buy a portable region-FREE DVD player for my 2 young kids to use at home and while traveling.  I would like to know if anyone has any suggestions for me regarding what to get.

Here's some information:

*I don't want to spend more than $100 (including shipping if possible)
*they are expensive in Japan -- buying them abroad can be worse with the cost of shipping 
*however, will be meeting a family member coming from Canada next month and COULD have an item shipped to that person's house so they could bring it to us in their carry-on baggage
*a small screen size (7") is fine because it is for travel, while at home can be hooked up to a TV
*battery LIFE is important - would like 4 hours or more if possible or else be able to use an extra battery

If anyone has experience with these portable players, I appreciate any suggestions.Simple answer is "No, you can't do hat".
Japan is ZONE 2. USA is Zone 1.

Equipment that is usable in many places is very pricey.
Best place to buy that sort of thing  on one of the French islands in the Caribbean. Like maybe San Martin.If that budget is a bit elastic, the region free 7 inch Philips PET 714B is $109.11 from Amazon. Only 2 hr (BUILT in) battery life. The 4 hr battery life requirement is not really compatible with a low price right now, although that could change.