Does anyone have any suggestions for cheap 3g and up modules? For 2g I can get a module off aliexpress that has 2g, GPS, and Bluetooth with a uart based interface for less than 15 bucks not including the antennas. For 3g, sadly I couldn't find anything anywhere near that price range and instead what I found was usually in the 40$ and up area.

In the USA, tmobile will be shutting down 2g in I think 2020, which is not that far off. Hence me wanting to get on 3g ASAP, but all solutions seem ridiculously expensive.

I haven't looked as 3g USB do goes in the past, they seem to be sub twenty dollars, but there is no way I am having my little micro with 8kb of ram run an entire host USB stack with enough resources left over for my code.