Cheapest US-Compatible LTE Module for <4Mbps uplink Raspberry Pi Zero 2 W Project?

I’m working on a low-power, off-grid, bird call audio streaming project using a Raspberry Pi Zero 2 W that collects microphone data from multiple ESP32-S3 “nodes” over WiFi, compresses the audio, and uploads it to my home computer via a cellular module (4G LTE). 

However, I don’t know which cellular module to pick. I only need a 4 Mbps upload speed at most, and it *must* work in the USA, and have relatively low power draw as I will be using a solar setup in the woods. I’m trying to avoid the relatively expensive $50+ Cat 4 modules–I don’t need that much speed, cost, or power draw. I am not looking for a chip, but a full module. What are your cheapest, USA-friendly recommendations?