did a little surfing for fire extinguishers... for the hanger:
http://www.ansul.com/about/NewsItem.asp?NewsId=46

for the plane
http://www.h3r.com/products/aviation_fp.htm from
http://www.sportys.com/acb/showdetl.cfm?&DID=19&Product_ID=1113
isn't bad, but I found a 1998 "new" 1.25lb 1211 bottle with
gauge for $60.... getting harder to find..

good read: http://www.h3r.com/products/cockpit_fe.htm