Lunchtime Deal: BOGOF or BTGOF Blu-Rays

All these acronyms make my brain hurt. I think I need to lie down and watch a nice movie. JB Hi-Fi's doing its seemingly near-permanent Buy Two Get One Free Blu-Ray offer at the moment, and not to be outdone, Big W's doing a Buy One Get One Free offer; BTGOF and BOGOF respectively. Clearly there's some balancing to be done there to get the best deal, depending on your taste in movies and the available stock. [JB Hi-Fi and Big W]