Done a search and came up with this one for $44 including s&h.
http://sewingmachine221sale.bizland....re/page36.html
This ones on ebay. It looks close. You can email the seller and see if they can take a better pic of the plug.
http://cgi.ebay.com/POWER-CORD-w-Ped...d=p3286.c0.m14
You don't always need that specific brand/item number. Which could be why you found it so pricey. You may even be able to call a local sewing repair shop and describe what it looks like.