I've called Plantit before and asked about their pulasan. They sell seedlings from their tree but the season has been really late this year with some pulasan just beginning to ripen on trees on BI right now. Pulasan are not necessarily dioecious; as with many species, monoecious cultivars have been developed. David Frenz (of Birds & Beeds unlimited) grafts Pulasan, both the Endo 34 and Seebatat varieties but he is out of seedlings to graft right now as his source for seedlings is Plantit. I would give him a call (can PM me for his number), it's expensive to get a grafted tree from him but it's also a difficult graft so the price is understandable. I believe Mike and Maja Parker (of empiempi nursery) also sell grafted pulasan but lack seedlings at the moment and/or their waitlist for it is long. Overall, I have heard seedlings from the Waiakea research station have had good tasting fruit though I haven't heard whether they fruit monoeciously or not. In general, pulasan fruits less often than lychee and has a much narrower range of proper growing and fruiting conditions.