Can't beat that deal...
That machine's a great find, even for the $15 they were originally asking. Normally when I say 'you stole that one,' I'm speaking metaphorically but this time, you really did! I've occasionally had a cashier misread a price tag at Goodwill, like when I got the final season of Star Trek: Deep Space Nine on DVD for 99 cents, instead of $2.99. But how does one miss ringing up an item that physically large?
I think the Heritage/Legend machines are my favorite Kirbys, but I'm really a sucker for the Heritage 1HD's bright orange bag. I picked up a Heritage II Legend at Goodwill about two or three years ago for $15 in absolutely pristine condition, except it was missing the cord. It cost me about $20 for a new one, but that's okay.
The price tag on the cord for yours reminds me of when I bought my Electrolux Diamond Jubilee canister, also at Goodwill, for $10 with a generic hose that had a $69 price tag on it. I pointed it out to the cashier as she was ringing me up and told her she was giving me one heck of a deal on the whole machine with the hose, wand and power nozzle.