1) does Apple still sell this software? If so, how the heck to I order it? Searching for Apple software in the Store is an exersize in futility!
This is a question a lot of people have. There's no clear answer, other than Apple don't seem to offer it any more.
2) I've found several suppliers of OEM versions of Snow Leopard Server for impossibly low prices. I have installation media, I simply need the license keys; is this a good route to go?
There is no such thing as an OEM version of Snow Leopard Server - or of any Mac OS X System.
Since Apple develop and sell both the software and the hardware, there's no OEM market - it's not like you can buy a Dell or a HP with Mac OS X installed (which would be an OEM version of Mac OS X for Dell or HP).
Therefore, any site offering an OEM version of Mac OS X is absolutely, definitely, 100% a scam.
At best they're reselling older copies (which is questionable), at worst they're a malware farm trying to con you into installing fake software, or charging you for something they can't deliver.
I just confirmed with our purchasing department (who talked with Apple Enterprise Sales) that Mountain Lion Server is the ONLY server software available at this time.
It looks like Buy.com among a few others still carry it... who knows if they actually have any or not. I'll see what I can find and report back.