Always research the Latin/Scientific/Botanical name of what you're wanting to find. Check the FAQ for this forum to find out how. This will help you find your sources.

leucaena tree = guaje tree = Leucaena leucocephala

See this existing thread for more info:
Leucaena leucocephala.

Click here for sources.

It looks like Violet referred you to my other post. I got mine at a swap meet from a Hispanic lady. It took me a long time to figure out what I had, but many helpful people on forum helped me understand the tree. If I see any more trees I can e-mail you, but the only other option I know of is starting them from seed. Seeds are available at Mexican markets. The other option, as Violet said, is finding the plant at a nursery in So CA by searching the botanic name. I believe I have also seen them growing them in some of the botanic parks in Southern CA, but I do not have an exact ID on the trees.

I sale guaje trees let me know with time so I can have them ready. Yo vende arbol de guaje llame con tiempo pa tenerlos listos gracias

Mii cell phone es 661-544-6802 mi nombre es luis guajes for sale