IoT Data GSM card (intl roaming)

Hi There! I need a GSM data card that I can use for some IoT devices that I would have in the field As you can expect I would like to get the cheapest one I can get, I've found this one: HOLOGRAM.IO These look cheap but before getting them I would like to hear if anyone has tried anything better

Thank you

Ok, trying to bump this up...Has anyone ever used these cards? Or any other? Since the roaming was "opened" for data across the countries, one doesn't not have to stick to their country providers for data cards, it seems that you can now buy a data card from any country, which is becoming common Anyone?