Attempted to get a battery from Costco. Unfortunately, they were sold out. The tire center clerk said that they had several last Thursday, but by Sunday, they were all gone. Computer didn't show that any had shipped yet, so I had to wait until Monday to keep looking. I went to the dealer and got a battery. They were more expensive than Costco, but cheaper than any of the parts houses. If they didn't have one, Carquest was my next shot.
While trying to lookup the battery online to see who had them and what they cost, I was greeted by some amusing messages. O'Reilly was sold out of their Super Start and Optima H6 batteries. They listed the Motorcraft, but it wasn't available here.
Napa wasn't sure if the battery was available or not.
Advance/Carquest had them available, but with the following disclaimer
All in all, I managed to get it installed, and it wasn't THAT bad. Worst part was probably getting the cowling cover off. Since it's under the windshield, it's where all of the snow melt flows and collects, so once the fasterners were removed, it was still frozen down. There's also a rubber flap the goes around the corner of the hood, which in those temperatures, may as well have been cast iron. Took some work getting it dislodged. I left the cowling cover in the boiler room while I had the battery removed, so I could clean the ice and frozen leaves off of it. I even got the BMS reset, so it's happy.