teotwaki
Excelsior!
This thing is military issue and is normally not sold commercially although I have spotted them on EBay.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=230181075557&ssPageName=STRK:MEWA:IT&ih=013
with shipping it is $35 for all 3 items which is not a bad deal as those insulated covers are excellent but no longer sold by Outdoor Research.
Or you can order just the cup from Practical Tactical
http://www.practicaltactical.net/prostores/servlet/-strse-237/MSR-Stainless-Steel-Nalgene/Detail
as I just found them after some pretty contorted Google searches. I ordered two and the shipping was still $5
They are not as lightweight as a MSR Titan titanium cup, but will be much more rugged.