deepdiscountdvd.com - but you have to be careful as there have been alot of people who have had their cc # stolen after using this site. They have a great sale twice a year - June and November I believe although you have to watch that too as they do raise the prices on some of the dvd's. Many people do the option of buy later or getting a one time cc # to use.
I buy from there and Amazon - although lately it has been Beachbody.com that has gotten all my money for workouts.
If you're a member of Netflix you can rent the videos through them and try them out. It's great for someone like me who needs a lot of variety to keep me motivated
My favorite site is Fitness Organica. They have a lot of hard to find ones and most of them have video clips that are a lot better than collage and once you become a customer they do all sorts of discounts.
The customer service is outstanding! The shipping is super fast!
Where do you buy your videos(online)
