Companies are not buying machines this way, but through resellers with drastically different pricing models (even CDNow). Outside of Office 365, I have never paid more than 50-75% MSRP for a Microsoft product using a corp reseller account, including SQL Server licenses.
This is a thread about the cost of gaming computers, on an article about Steam games on Linux.
I don't think business-targeted sales are particularly in-scope. And even if they are, that only makes it worse, as it implies they're getting an even more significant profit margin.