Where are the cheapest vegetarian Glucosamine supplements available?

My mum is a vegetarian and so can not take the normal Glucosamine supplements (with fish oils etc) but we have found an vegetarian alternative in Boots the chemist but they are very expensive. Are there any cheaper alternatives anywhere (maybe on the internet)? Also, she is taking these for joint pain problems, has taking Glucosamine helped anyone else with similar problems? Lastly (!) the pain that she has is in her knees and also in her feet which makes it difficult for her to sit on the floor or move around quickly. Are there any gentle exercises that anyone could suggest? Thanks!

sorry,no idea!

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