DVD and video tape sales can be found at just about every movie store and rental chain that you visit. The Internet is also home to such sales, and some other interesting avenues to explore as well.
Online auction websites are not local to where you're connecting from. When you shop at an internet auction site, you're exposed to sellers from around the globe selling a variety of products that you may not be able to find locally. This is true even for movies, with auction sites being home to many video tapes in the PAL and NTSC formats, and DVDs from regions far beyond where you're located.
When browsing online auctions for movies, you must be careful that you're not bidding on items that you cannot play. If you're located in North America, video tapes PAL likely won't work on your player. So, if you're interested in purchasing movies from outside of your home country, you will probably need a player that's capable of converting formats so you can properly view the films.
If you're tired of DVD and video tape rentals locally, movies found online can be a breath of fresh air. Buying foreign movies online could also be a convenient way for someone who's emigrated to stay up-to-date with the films that are being released back home. And, if you don't have the right VCR or DVD player to play foreign movie releases, you can usually find them right alongside these movies at most internet auction websites.