The deal can be found here. The deal requires promo code EMCYTZT4733. It includes free shipping. Newegg charges sales tax in California, New Jersey, and Tennessee. This is a 48 hour deal. It expires on Oct. 31 -- Halloween -- at 11:59 PT.
For price comparison's sake, the same software can be found at Amazon.com for $139. Amazon.com has caved and now charges sales tax in many states, although it continues to fight against it in several others.
You might ask, why is the product labeled OEM? Or, in the case of Amazon.com, why does it say System Builder? In a nutshell, it is because this package is designed to be used by those creating systems for resale. The details and Microsoft's stance on System Builder licenses can be found here.
This is the sort of software that is used by Dell, HP and other laptop and PC manufacturers, and comes pre-installed on pre-built machines. It is tied to that machine and in fact, the motherboard. If the motherboard is replaced the serial number is no longer valid. Of course, if Dell were to replace the motherboard of your machine for some reason, that issue will be corrected before it is returned to you.
If, instead, you were the replace the motherboard of your home-built machine yourself, you'd have to tap-dance with Microsoft to get the serial number reactivated. Eventually, if they believe you, they will relent.
Additionally, the OEM software only comes with one version of the OS. That is to say, it does not contain both the 32-bit and 64-bit versions of the system. It also is not sold in "upgrade" form. That is OK for most of those opting for this option, however, since a clean install is preferred by many, eliminating the dross from the older installation of software.
This is the Professional version of Windows 7. Microsoft also sells Windows 7 Home Premium, which is a more limited version of the platform -- though it can be "Anytime Upgraded" to other versions. One key missing component to Home Premium is that users cannot Remote Desktop into the machine, unlike Professional. There is yet another version that can be installed on a computer, Windows 7 Ultimate, which contains everything Microsoft offers, but the name tells the story: Professional is "good enough" for professionals.