The industry I work is is VERY competitive.. Our major competitor about two months ago doubled the prices of everything in their store, then put everything on sale for 50% off.. ie: 50% off = Their old regular retail price. So they can fool customers with negotiating prices to like 70% off.. Which is really 20% their old retail prices..
It's an old and dirty sales technique.. It's ESPECIALLY commonly done for manufacture controlled priced items.. Apple is a perfect example of this.. Apple controls the prices of their products.. Best Buy or anyone else is not allowed to put an ipod, or Macbook on sale.. Only Apple is authorized to change prices on their products..
What a lot of retailers do with manufacture controlled prices is double them, then put them on sale 50% off.
Macbook may retail for $999.99, then you'll see on a website in the price box "Regular: 1999.99 / You pay: $999.99"