Well, no one has been successful with leaf cuttings from D. indica. Not saying you shouldn't try, but I would take care not to remove much material from the donor plant; as this species grows from seed. Happier D. indica = more seed.
These are some really bad companies, all shells of Plantron Inc., so don't order from them unless you want small and dead plants they don't want to refund:
Farmer Seed and Nursery
Four Seasons Nursery
House of Wesley
Richard Owen Nursery
How do garbage companies like these stay in business, ripping people off year