Most rollers are only about $20...this is the one I use from Academy Sports. Rollers help relieve muscle soreness and improve mobility and core flexibility. If you've ever heard someone talk about them, they'll say "they hurt so good." It's the truth...especially on your ITB...they hurt but afterwards you feel fantastic.
You can find lots of YouTube videos on the best ways to roll for certain problem areas, but here are a few of my favorites:
I find it especially helpful to roll my ITB and calves out before and after a run. It's a nice reward for sure!
Here's to health and recovery!