While waiting for SPX to send someone, I did some research and found out that the old AVCON standard is electrically compatible with the new J1772 EVSE standard even though, mechanically, the 2 plugs are very different. I have also found successful AVCON to J1772 conversiona like that shown here.
Then, I remember about 12 years ago, when I rented the Ford Think City for a month (from Fremont BART station, for those in the SF Bay Area), I bought an used AVCON Powerpak EVSE to charge the Think at home. The AVCON has since been sitting in a box in the garage ever since. So, I bought a J1772 plug + cable from ebay for $190 last week.
I got a chance to swap out the old AVCON cable with the new J1772 cable this weekend. The EVSE self diagnostic showed green, when I powered it up. So, I proceeded to plug it into the Volt. The Volt honked, and I heard the relays click. It was charging from 240V!
So, this could be the cheapest way to get Level 2 charging at home if you can find old AVCON chargers that are being phased out.