Ok, the DVD Clone2 software whom is the software developer? From what it sounds like your source dvd media is a DVD9 format and your trying to fit it onto a DVD5 aka 4.7G media should work under dvdshrink? Are you sure you pick the correct media output settings in dvdshrink??? ie meaning you choose dvd5 format but rather it is set to do dvd9 and giving you the message to use a dvd9 aka 8.4G media? Where to buy DL media depends on where you live since I don't know where you live I can't give reliable source for you to lookup.