Downloading various Apple OS versions to put on USB Flash drives for quick installs. Need to grab some 3-packs of 8gb flash drives tomorrow. I'll have Snow Leopard. Lion, Mavericks and Yosemite ready to go.
I've got a handful of Macs of different form factors/flavors just about ready to list on the Eghey. These are all Intel based Macs that will run Windows 7/8 in dual boot mode.
Nice thing about Apple is they don't have the Bullshit Serial numbers/Keys like Microsoft does. You can pretty much buy an Apple OS install disc from anywhere and install it. The only exceptions are Server versions that require a serial number. But you can buy those versions for under the price Microsoft charges for an OEM version of one of their standard consumer OS.
Heck many of the latest Apple OS versions are available as a full downloads as "upgrades" from their App Store. Downside? Apple charges a big premium for their hardware. A new Mac Mini without any "Bells/Whistles" is over $800. You'd also need to buy a Monitor and Keyboard/Mouse in addition!