Alright, here's the dealio...
I used the salvage yard inventory website http://www.car-part.com
to track down these wheels. This particular seller I chose was closest., but there are many others out there with i3 wheels.
Price was $150, and upon contact quoted me 40 shipping. This seller had this listed as "front" under the search category. I initiated contact through an automated web inquiry, but nowhere in the inquiry text did it say "front" or list the pertinent dimensions,. All of the rest of our business was conducted by phone, text, email, and scanned PDF I signed for credit card authorization (on which i wrote "19x5" but not "front" or the tire size.
So that's why it fell apart, because he said "I've got a couple of these" and he sent me a photo of the nicer looking wheel, which I okayed. Frankly, it didn't even cross my mind that he would mistake a front for a rear, but hey, the i3 is an quirky little buggy.
He offered to ship the correct wheel no charge, but wanted me to cover return shipping of the rear wheel back to him. I didn't even bother to argue because I figured I could move the rear with no problem for a better price and cover my cost and put a few bucks in my pocket.
I ended up shipping it to a buyer in LA. The $37 online FedEx quote turned in to $44 in the store: I used listed weights of 18 lbs for the wheel and 19 lbs for the tire that I found with a web search, but actual scale weight was 43 pounds. Plus insurance, which I always decline but didn't. Then when I swiped my card the $44 in-store quote ballooned to $60 for "special non-FedEx packaging" which was ridiculous. Lesson: pay for & print the shipping label at home.
Anyhow, for a sale price of $250 shipped, the shipping ate up any profit, and that's not counting the leftover green holiday Glad wrap I bought at Safeway that morning, another $6. My time, of course, is free. I was still technically ahead since the correct wheel was being shipped to me for no charge. I called the salvage yard to tell them I "would be keeping" the rear, and they were cool with that any only charged me $150. Last I checked, even with the Glad wrap, I'm slightly ahead of where I would have been. Let's just call it a wash.
Rear wheel quadruple wrapped and LA-bound, ready for the handoff to FedEx.
Last night I came home to a package behind the garage.
Who wraps a wheel like this? I can already tell this one is is slightly worse condition than the first one, which was nearly pristine.
Peek at the hub and the size & offset check out.
Dirty, but looks pretty good!
A few inches of light rim rash, not awful for a spare, but not par for an "A" graded wheel.
I'd have been fine with a bald tire -- the tire was bonus, many sellers list the wheel only -- but the tread looks close to new.