I would suggest checking Mesa Gardens seed list in January. Some years they have some good selections of Manfreda. http://www.mesagarden.com/ and; http://www.koehres-kaktus.de/index1gb.htm which also has a good selection of wild collected seed some year, but the fees are too much for a few packs of seed for some in the US. and; http://www.peckerwoodgarden.com/ which is part of Yucca Do and some years they have Manfreda. I have contacted some people at Cornell where Verhoek did her PhD work and it seems her collection of plants was either distributed or slowly killed through neglect. I may try one more time to see what may still be left there. The Prochnyanthes from Rarepalmseeds germinated very badly. Of the 100 ordered (ca. 50 or less received) only 9 germinated, 5 rotted off and 4 are now growing well. Two more dormancy periods and they may flower. Aaron Floden Knoxville, TN