Water hyacinth is frequently listed on ebay, just put the name into
the search engine there and take your pick.
Its not surprising water hyacinth is more scarce this year, many
southern areas had quite severe winter weather, many folk will have
lost them outdoors
http://www.members.aol.com/abdavisnc/swglist.html
(andys aquatic plant list for interesting swaps
---------------------oo-----------------------------