$2.50 / month through Branzone
Also can double as fast download link. And you can upgrade specific areas of your plan or downgrade when you want. For example... I started at regular $2.50 plan and then upgraded from 10GB bandwidth to 25GB for an extra $1 per month without paying for other extra BS.
They're also great with support in general and their servers are priced well. They've set up sourcemod for me in the past and fixed problems I've had within a day or so max.
https://www.branzone.com/aff.php?aff=445