If you are refering to portable players with video screen, the branded MPEG4 compatible players I saw is Toshiba and Panasonic.
Toshiba is sold in SM Appliance, Rockwell for around Php25k but AV Surfer, 4f Rockwell is selling it at around Php22k ~ 23k at 12months 0% interest on credit card purchase. Price Smart also selling this Toshiba model for about the same price as that in SM Appliance.
I can't remember where I saw the portable MPEG4 compatible player for Panasonic - I think it was at Park Square.
I only window shop for these players so I can't say anything about their quality
.