The trick I use for AM is they have a single user deal $99/12 months. You can almost always find $100 iTunes gift cards for $80-$85 making your effective price $6-$7/month.
You just have to keep an eye out. My sub renews over Christmas and I got one from PayPal for $80. I think last year Amazon had a lightening deal for $80 (may have been 2 $50 cards for $40 each). $85 is pretty easy to find though. I think PayPal just had a deal earlier this week.
If you can buy them in a place with good credit card rewards percentage on the gift card it's even lower.