Newegg has just made it clear what you can expect to save when picking up an OEM copy of Windows 7 and its quite a healthy saving indeed.

A full version of Home Premium will set you back just $99.99 after a $10 discount, $100 less than the retail version, whilst the Professional and Ultimate versions will set you back $134.99 and $174.99 respectively.

Just remember, if you go OEM you lose the ability to transfer your licence between PCs and also cannot use it as an upgrade option, but this shouldn't be an issue for most.