It's definitely primarily due to a stock shortage. Sony is slowing down production of the 40GB models so as to introduce the new 80GB models. However, the 80GB models aren't coming until September so it's going to be a long month for Sony trying to meet the consumer demand while phasing out all the remaining 40GBs before the 80GBs hit.
In short-term, things are looking up for Sony's sales this week. Retailers just got new shipments of the 80GB MGS4 bundles and I think we all know that those are going to sellout quickly so I expect that PS3 sales will see a bit of an increase this week before falling back down due to shortages.







