I'm a video store manager, I get these at cost. Would you like me to A: tell you what distributors are actually charging for this, B: get you one for very little over cost? Lemme know. Movies aren't bad usually, WalMart often sells new releases for cheaper than I can buy them, bot the markup on box sets in stores is just ridiculous, often just short of 100%, meaning I can get them for just over half the suggester retail price. Lemme know.
BTW, the site you're looking at is selling foriegn product that likely will not work with a region 1 dvd player or your NTSC type video equipment, TV, reciever, whatever. Also, you may get foreign language menus, package art, etc. Great way to get them cheap, but you may need some equipment you don't have and get miss out on some content/special features/booklet that comes with the US, region 1, NTSC version. Choose wisely.