I’m using systems from Onset U30 which have been upgraded – see a post I made elsewhere. The sensor interaface is typically 20mA current or Voltage.
If you are after an Arduino shield its only going to be the typical Arduino distributors.
For “coming soon” that should be Arduino suppliers you could make a downpayment on
For currently available – but probably not recommended for small project runs, ie if you buy a lot the price could drop
NimbeLink, LLC Skywire
For professional grade with power available these might work.
and they have lots of data plans