Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
You're all on drugs (or simply don't know the right person, but I prefer the inflammatory and accusatory former) :D.

If you're buying a load of stuff, CALL apple sales. Sound professional and like you know what you're doing. Apple phone sales seems to have more latitude than the stores.

If you're buying for a business, you need to find your top-secret Apple SBPro Account Manager. If you are in a large business that does NOT have an Employee Purchase Program with Apple, get on the stick with your EPP person for other computer companies (the Dell EPP rep at your company is in a position to hunt down an Apple EPP agreement).
 
In my experience you can haggle as much as you want with Apple you don't a chance of them giving you any discount on any of their products.

However third party products are a different story, spend enough and you can come out with £100's of pounds worth of accessories for devices you don't even own for free.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.