|Witchfinder General (Blu-ray)||R2UK|
Blu-ray releases of Witchfinder General are available in Region All UK and Region A US, where the film only seems to be available as part of a Vincent Price collection. Both have a great range of extras including different audio commentaries. For details see here.
If you are interested only in the film as a standalone, the Region All UK release is the way to go.