I know a couple of sites you guys can try
The first one is fansub.guckies.com/
This guy makes homemade dvd. They're usually good quality, and if the dvds are damaged he'll replace them no problem. He also does trades. So if you're tired of some of ur series he'll swap you. He goes by the number of discs. I was able to get 4 series for my Real Bout High School box set. You can always make copies of ur dvds and trade them for his; he has no problem with that. The series are usually in Jap with English subs (unless otherwise noted)
Now the another site is ezanimez.com/
This is a pretty good site. I was able to get Fushigi Yuugi anime series plus OVA and the Eikoden for $75.00
And then there is always Half.com and Ebay.com
Half.com and Ebay.com
I use those like 99% of the time <3 Otherwise I use overstock.com for dvds per volume and buy all my manga there.
Best buy!
For the most part, Best Buy is expensive (buying per volume, depending on the series), they do have a bigger variety compared to Target and Wal Mart, but they don't always have all the volumes in stock for certain anime. Buying box sets there is sometimes cheap though!