old Mac cord?

I feel your pain and wish I could help. Mine gave out 1 day before the 3-year extended warranty ended, on a Sunday. I was able to call the apple store and get them to send me a new one free, but I had to return the old one to them.
You might try CW computer out west. Otherwise it's $80 + from apple. Ridiculous.

try ebay. You can get an offbrand one for less than $25. 

https://cgi.ebay.com/60W-AC-Power-Adapter-Charger-For-Apple-MacBook-Magsafe_W0QQitemZ260383388400QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item260383388400&_trksid=p3286.c0.m14&_trkparms=72%3A1234%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1308%7C301%3A1%7C293%3A1%7C294%3A50

I laugh at your definition of old. I have nothing that new..

I got one thanks to the able & kind Ironic1. Kokigami: the last time I had my computer serviced they called it a relic. You're right; it's only as old as it feels. 

Thanks PDD world!

I think I have one.  I'll check back later.

lojasmo - one was generously donated, thank you kindly.

https://www.newegg.com/Product/Product.aspx?Item=N82E16834997289&Tpk=ibook%20power%20adapter

This is a solution for your PowerBook G3 Series (with or without Fire Wire), iBook (with or without Fire Wire), or iBook Special Edition (with or without Fire Wire) computer.

The 65W and 85W ones can be had for $80 at newegg also.