Coccyx cushion

#1
Hello everyone so I had a open excision about 6 months ago which still hasn't healed and I have started university now. I struggle sitting down so I have bought a coccyx cushion for this issue but it hasn't helped much, this is the one that I bought http://www.argos.co.uk/product/8650610

It worked good for a bit but it gets flat really quick. So can anyone please recommend me a good coccyx cushion from amazon thanks.
 
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