The major record labels have been largely responsible for the $9.95 per month prices being charged by the streaming services, even though most industry experts see that as a barrier to entry, meaning that it's just too high. Ideally you want more people paying a monthly charge, even if the price is lower, since it will ultimately mean more revenue at the end of the day.
There's at least one new music service that's managed to keep the prices low though. The new Cur Music has two low priced tiers that break the $9.95 mold.
The first Cur tier is called "Octo" for $2.99 per month, and the higher priced "Inked" tier is $6.99 per month. Both tiers are ad-free, with the only difference being that Inked lets you listen offline.
Cur has a library of 10 million tracks, and emphasizes playlists and radio rather than on-demand streaming, so it's competition is more Pandora than Spotify. It also has an internal messaging system that lets users attach photos or videos to songs before sharing them.
There's a free trial that you can check out here.