Android box with 3G/4G LTE SIM slot?


Hi guys,

Wondering if anyones found an Android box with built in 3G/4G SIM slot built in? I have some digital displays with no WIFI connectivity, but wanted to get a box that I could just put an active SIM into and be able to have connected.

All I can find is obscure alibaba sites that want min order of 1000, no direct to public sales.