Greetings Expanding!  There's a thread I started about UK extraction supplies somewhere, have a search.  For the plants, many of the companies in the suppliers thread sell all sorts, so check them out.  Maya Ethnobotanicals have LSA containing seeds and Spiritgarden and Dutch Divine Cactus do cactus seeds, but no-one seems to be doing large amounts of chips at the moment, they've all 'drid up' if you'll excuse the pun!