i needed 3 when i wired truk, radio shack was still around at the time, they were getting $2.50 per diode at the time. i ended up buying a qty100- 1N4001 diodes on ebay for $3 shipped. 1N4001 is the diode recommended to me.
amazon has 5 of this type for $3.04 shipped amazon was not as popular back then