For any kind of back pain, upper or lower and sciatica, I use this. it is a fantastic new age hippie back roller that you lay on in such a way that the two inner wheels apply a lot of pressure to the acupuncture points along the spine all the way down to the bottom of the hips.
It also pushes the vertebrae back into place, especially if they are bulging outward, like I think I have in my lower back.
It also provides excellent relief to sciatica pain simply by applying pressure to the back of the hips. Sciatica is pesky though, and the pain can return.
It's about 50 bucks form the official site, this thing has been around for a long time, don't order cheap knock off of it off of amazon. it matters what it's made of and it should be one piece of wood, not two.
http://www.themaroller.com/