Saw an ad on YouTube this morning that lead me to this. Apparently Digi-Key has partnered with cellular providers to offer SIM cards for IoT applications. They're available in much smaller data increments, and are as cheap as $3/mo for 300 KB and $0.05 per SMS message. Even at $30/mo for 1GB it's cheaper than what Verizon offers directly. 

I'll need to explore this further once I know more about my data usage. We got the pole delivered today, so we're getting closer to a finished system.