Where are you supposedly buying brand new releases for $8.50
Ive been through many suppliers and have never even heard of such a price on a brand new release unless it is a bootleg.
Official MPAA Licensed Distributers release brand new releases of movies to us for $15.99 for a fullscreen copy and $18.99 for a Widescreen Special Edition version of the same film. And thats the same every Retailer in the United States pays for them as well.
And if your Paying $3.50 for newer releases Dont expect to make much profit unless your selling hundreds a week since Used Dvds go for the same price and you can aquire them much cheaper buy running classifieds in your local paper .
As far as your first questions You can goto Link hidden: Login to view and buy them at good prices but make sure to buy several to reduce shipping and increase profit margins.