I would like to offer a buy one get one free type discount. We are going to be selling picture dvd's and would like to offer for every 4 dvd's you order you get one free. I am running version 1.8 and want to see how this can be done or if possible.
This is definately possible but nopcommerce can only come with standard features. Features like these has to be implemented, so you have to do it yourself or ask a developer like me ;) or ask nopcommerce team.
if you only sell dvd's then there is a simple way which is in ordersummary.ascx, you count for items in shopping cart and if they are 4 you show a message that the 5th one is free or something, this is only a basic standard approach.