Popped in to Taunton HMV on my lunch and spotted this little deal. Sony PlayStation 3 (PS3) 250GB Console RRP £284.99 NOW £179.99.
I can't confirm if this is Nationwide for all HMVs however, something that does point towards that it will be is the fact the barcode was HMV printed and stated the £179.99 price. So if your local store has stock, ask them to check the price, I'm sure you will be paying the £179.99.
Thanks to viki66 for posting that she obtained one outside of the Taunton store. Best to ask staff to check stock levels and look out back as they may not be on the shelves.