This looks interesting:
Super SIM is a global cellular connectivity platform to connect your IoT devices around the world. With a Super SIM in your device you’ll be able to connect to the most comprehensive list of Tier 1 global networks via one SIM. Powered by Twilio’s own cloud-scale mobile core, you have the freedom to choose your networks, so you can optimize for coverage, performance, and price. Use highly available APIs to program your connectivity operations, from changing SIM status and tracking data consumption, to sending machine-to-machine messages to devices.
Super SIM gives your IoT devices access to over 300 cellular networks around the world.
It looks like it starts at $3 for the hardware plus $2/month. Data is $0.10/MB and SMS messages are $0.05.