Forgot to mention that I'm from Denmark.I've got 12GB of mobile data (and 12 hours call + unlimited texts) for 79dkk per month = 11.5$ per month.
I usually use about 2-3 GB of the data per month, but I can't really save anything changing to a plan with less data.
I currently pay Sprint around $170.00/month for my 6GB shared data plan with my fiancee. With that said, that number also includes the leases they put on you these days and unlimited talk and text. I only ever use about 2GB as I'm almost always connected to WIFI.