I finally heard back from Flying Pigeon LA today and they're going to ship me a new crank arm and some "better replacement pedals", whatever they turn out to be, tomorrow. I smushed the threaded bit of the cotter pin whilst removing it so I supposed I'll need a new one of those, too. Anyone who's had to replace crank arms know what size pin they take? I notice they largely come in 9.5mm and 9mm sizes.

The $43 in maintenance wasn't parts, it was paying the LBS to true up the rims.

So far I've spent $328 on the bike and components, $43 on maintenance and spent about 20 hours in labor, including initial assembly. Out of 8 commuting days it's been rideable 4, or 50% of the time, with 1 breakdown. Current mileage is 25.