Be careful, you don't want to buy a really cheap one. I believe there is still no regulating body that has outlined any safety measures required to sell inversion tables. What you need to make sure of is that the device that locks your feet in, won't release you unexpectedly, so you'd fall on your head when you fully invert. You should be able to find a FAQ or something that tells you exactly what to look for in a table that's safe.