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Look on Ebay.co.uk and search for bamboo seeds. There is a huge selection of seeds, of all colours, shapes, sizes etc. My only problem has been that I have been unsuccessful in germinating them, but then I am a crap allotment holder and gardener.
Dont be so hard on yourself. They wont germinate in compost or soil but i find a half and half mix of vermiculite and sand works well