Whenever I rip a movie from a DVD, the movie seems to be around 695-725 MB. Regular DVD-R discs can hold up to a capacity of 625, if memory serves.
Most DVD's include games as well. After considering all the materials in DVD's, I'm assuming the the movie industry compresses them and stores them. But usually, compressing files result with low quality movies. Only certain formats that I know of H.264 seem to retain the quality, if not somewhat. How does the movie industry store such a large file in addition to the extra features in a single DVD? (Excluding those movies that require two movies. Such as Movie, and the other is special features.

Aren't those blue-ray discs?
blue-ray discs would probably hold more memory due to their high quality vids.

Where the heck do I get those DVD discs?
I've got a DVD-R disc that can hold up to 725 MB. or something like that.

Note all prices are in US dollars and cents.

CD-R discs costs pennies per disc.
DVD-R or DVD+R cost dimes per disc.
DVD-R DL or DVD+R DL cost a dollar+ per disc.
BD-R costs several dollars per disc.

You can find dual layer (DL) discs at Walmart, but it's a specialty item for such a store and the price might not be good. I would suggest Sam's Club or Costco if you want to buy them in a store. Otherwise, shop online for good prices.

Gmanlink, before you run out to Walmart, you may want check this. And there are a few more here.