I have found that a wedge shaped pillow with a bite out of the high end works for me. I used to have alot of back pain from sitting at the computer for many hours a day but this pillow takes the pressure off my tail bone and prevents most of the resulting pain. I got this in the US but Amazon has them online. http://www.amazon.co..._sim_hpc_3 The cushion is not perfect as it flattens out with alot of sitting but still seems to do the job.
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