Let me look into that -- is there a better place to buy them from?
I got mine 7-8 years ago and i dont remember where. Theres a guy selling one on an infomercial now that appears to be made well. I dont know how pricey it is though. Mine is very beefy and well made. I would expect to pay $200-275-ish for a nice one. But your spine and muscles will thank you.
Another spine miracle, although not really super geared for low back, is Two tennis balls in a sock. Laugh, but its saved me thousands in chiro visits.
put them in the end of a sock. align them under your back (on the floor) in the middle of your shoulder blades. One ball each side of your spine. It takes some getting used to, the first time for me was about 20 seconds and it was uncomfortable. Now I can lay there forever.
Once your in position, just relax(it takes a minute) and let your shoulders fall and go limp put your arms out to the side, this may hurt a bit at first, they wont want to touch the floor. After using for a while, your back muscles, pecs, rotators, traps, ect...will become more flexible and not be so tight. More flexibility = happy muscles. But the real great thing for me is, my back will crack and adjust when laying on them. You will learn how to slide down on the tennis balls and get them in between every Vertabrae and it will adjust it if its out.
I really know if I am slacking cause my neck and traps will tighten up. I will get a muscle knot (neck) headache from hell. I go lay on tennis balls and get the cracks my spine needs to release the muscles.
Really helps with my rotators too if its in between my shoulder blades and I just let my body relax and fall around them and lay there for 5-10 minutes. Keeps everything nice and stretched out.
My deep tissue massage therapist taught me that trick. I thought it was the gayest sounding shit ever till I tried it. Between that, and an inversion table....you will never need to pay for a chiro. Well....unless your really fucked up.
You may need some chiro help to get the nerve settled down a bit to begin with, but I seriously doubt it. Hanging upside down is the best thing for your spine. (if you have a healthy spine that is)