At Apple’s Online Store today save on Mac mini and MacBook Air models. The refurb. Mac mini with a 2.5GHz Intel dual-core i5 processor, 4GB of RAM and a 500GB hard drive has been reduced by $90 to $509. For $929 is the Mac mini with OS X Server, a 2.3GHz Intel quad-core i7 processor, 8GB of RAM and dual 1TB hard drives….