I don't think you usually get the cheapest prices on the high street, internet sites are your best bet if you can use them. I use play.com quite a lot.
It may sound like i'm playing a broken record here but play/playusa.com really are the best retailer for DVRAB - I'd even rank them above amazon in terms of cost and service
True enough - the 3 for 2 sales in HMV are often full of little bargin gems and Woolies will often match brand new top 10 releases on price for at least a week. However, for constant day after day value and range, the internet is the only way!
I always use play.com and Future Entertainment for all my dvd purchases. Both sites have order tracking which enables me to order me with confidence. I've never had a problem with either.