I agree with Ideation this last year I have seen more genuine bred collie x litters than I have seen for a few years, bred from genuine dogs by genuine lads. I honestly regret not having one, but the time was just not right for me.
However I have seen several very good Hancock bred dogs over the years, and many dogs with his blood lines in which I would of gladly liked to own at the drop of a hat.
Personally I would not purchase, encourage or endorse 'dog farming' on principle, even for supposedly a good dog. If you want a collie cross dog keep your ears and eyes open, be patient and don'