If you want to get better discounts than Apple Business can provide, buy all of your software from Amazon.com. There is no hassle about which discounts you get at what level of pricing and you get the same support from Apple. In most cases you might be able to download a trial version while waiting for the delivery of the software and then just enter in the license key if it requires one.
For instance, Apple’s Aperture cost $199 at the Apple Store online, you might be able to get a 5% discount calling Apple as a business, but Amazon has the current version for $157.49 as of today, a 21% discount. Amazon also have other avenues that might sell it even cheaper.
In these tight times any savings helps in the long run.