I too "third" the Zu Birth..... picked my first one up (some time ago, btw) from them at auction , and just bought a 1.5 Birth last month on AGON.
Paid 75.00, shipped, for each. Excellent cord for this price... very good, in fact.
I also have built my own cords with 83802. Great DIY cord, and if terminated with good connectors, it is actually damn good.
I also use an HT Fantasy, a HT AC11, and a Audience PowerChord.
Against these pricier cords, you can do pretty well with the Birth and the 83802 DIY for the price.
Check out Audiogon, as used power cords are plentiful, and are not exactly selling like hot-cakes these days. You can find a nice cord for <$100., or near that, if you spend the time to peruse.
Good Luck,
BOK