Monrovia sells a plant that they call "ohia lehua i hawaii" or something like that. Picked one up at a local nursery here in central FL. Don't think its a true lehua though.

I Hawaiian kine borrowed a lehua seedling from my in-law's house once years ago when visiting them in Hilo but it didn't survive the transfer. I'd love to get my hands on some seeds as well.

I think this person sells these seeds: SmileClairelove@gmail.com. Give it a try.