My experiences with buying seeds has been a mixed bag, but the one seller who has earned my trust is Maryoto. His seeds germinate at greater percentages than seeds I have acquired from other vendors, including some who are very well-established. I do think that acquiring often-recalcitrant tropical seeds is a fairly risky endeavor simply because of distance and logistics. Particularly for me, since I only buy SE Asian-species seeds. For American buyers, the process requires someone who is educated in and can navigate the U.S. small seed lot import permit. Maryoto has proven himself to be that person repeatedly.
also, need to keep in mind the logistics.
this is prime SE Asia seed hunting time. However, at least in the Hawaii perspective, these Indo/SE Asia packages go through Japan/Korea/China during the WINTER. I have paid for DHL and seen germinated seeds DOA. All it takes is sitting in an unheated holding facility for too long to freeze stuff.