It is possible to bread the Barclaya also with bulbs. They get under good condition small "Daughter-Bulbs". The second possibility was breed them over seeds, but this takes long time. The most Barclaya on the market I think are collected, because it is to complicated to breed them for business. I also get Barclaya without bulbs, but the reason can also be that they loose the bulb.
Regards, Oliver Knott