XBOX currently has a promotional 1-month for $1. However, they also have 3 months of "Ultimate" for $1, which includes unlimited gaming and Live. Sign up for the first month, then immediately use the second offer. You can also just cancel recurring, and allow it to stay active until April 2020. I would think the Ultimate would also work for current Live subscribers to add 3 months.
This seems like a great way to also get all the Sale prices, even if you never use the "Live" features.
So for $2, you get 4 months XBOX Live + 3 months "Ultimate" .