Hi Grumpyoldman! First off Weldcome to the World's Greatest Welding Forum!!!
Here's a listing for 122#'s of Thermal Arc SF-1A 0.045' Diameter - 11# rolls each in Los Angeles... They may still have the wire although the ad was listed 2 years ago... Make an offer, and here's the link:
http://losangeles.bidbut.com/a,37,2370508,Weldingwire-25Rialtofontana.htmAnd this is the main website for NSSW: From March 1st 2013 Nittetsu as trade mark logo on products from Nippon Steel is changed to NSSW logo.
Meaning, instead of Nittetsu SF-1A the new logo will read NSSW SF-1A... here's the link:
http://nst.no/produkter/r%C3%B8rtrader/sf-1a/nittetsu-sf-1a/With respect to purchasing the product, your best bet is to contact your local welding supply (LSW) outfit and ask them to find out whether or not they can order it for you and of course, @ what price etc.... And as Lawrence already stated earlier there are equivalent grades of FCAW wire offered by Hobart, Lincoln Electric possibly and a few other manufacturers of seamless FCAW wire also... Last but not least! Don't ever let them try to sell you something else that's almost as good... All the best to you.
Respectfully,
Henry