Thanks for the suggestions. Probably try the Permatex Black Rubber Sealant RS-9 temporaily, it's a really tiny nick that doesn't seem to go all the way through (no visible hole on inside). Only reason I found it was that it was wet outside and I saw the bubbles coming from the air leak. Will replace tire soon.

Was going to invest in some fancy Grand Bois, but the flat in the Panaracers gives me pause as I realize our street kinda suck particularly this time of year.