Polaroid PDV-0700 7" Portable DVD Player
You get what you pay for
I bought this particular DVD player at Best Buy, and while it does what it's supposed to do, which is play DVDs, its build quality is mediocre at best.  With a 4 year warranty in hand, I've had to replace my unit 4 times now.  Problems include - no audio from speakers, black and white picture instead of color on the screen, and recently, the lid just won't close.  If you want a cheap DVD player, you probably cannot do better than this.  I highly recommend getting an extended warranty though.  It'll definitely pay for itself in the long run.