I know that everyone raves about these being extinct, but I scored 18 of them some months back from China and after googling for 5 minutes found more places. That have them instock. Granted you may have to do a wire transfer and deal with some foreign sales reps, still its not impossible.
http://www.1sourcecomponents.com/partinfo/sn76477.htm
and http://sklep.avt.com.plFor about $9.00 US before shipping.