[quote="Eric"]A lot of the box sets I have purchased are around $20-$40. I get mine from
http://www.sundevildvd.com
http://www.animovies.com
They are the imported ones with English dubbing.
The manga that Animovies has is pretty cheap too]
At prices like the ones listed on those sites I suspect Taiwanese bootlegs. I'd check your discs for copyright info and brand marks. A lot of pirate discs leave that information off.
Any legitimate imports would normally be of a region code other than 1 or 0, (Region 2 for Japan and Region 3 for Hong Kong) and the existance of Chinese subs are not normally found on legit discs.
http://www.digital.anime.org.uk/piratefaq.html is a good informative site, and the subsection
http://www.digital.anime.org.uk/piratefaq.html#dvd details things to watch for.