jay is the mangosteen expert and he'll give you the full scope but until he posts...
we did see a grafted mangosteen at excalibur- if i remember correctly it was about 18 inches to two feet tall. I think they were asking $150 (obviously you will have to pay additional for shipping). I think J felt the price was unreasonable and passed up on the plant.

with regards to planting seeds from the fresh fruit, the fruit is irradiated before it arrives in the US and some people think this will not able any resulting plant to bear fruit.

check in with jenes tropicals, she may also have a grafted mangosteen

Well the $150.00 price just took that off the list. To much of a risk for me for a plant that I may not be able to get to do well. I was thinking they may be closer to the $50 range. I've got seeds coming from you, Jay, and maybe from Malaysia (ebay seller but I am not sure if the shipment is ever going to make it). So I am hoping at least one seed is viable out of all those. Have you tried planting any from your mangosteens? Do you know anywhere to buy seedlings?

I did find some at Montoso gardens in PR, but between the pytosanitary cert and shipping the price is kind of crazy for a 4" plant.

The price of the plant may have been $100. But from what I was told, this price could and does change from week to week...might be less, will probably be more.

I did believe the price at the time to be more than I wanted to pay at the time. If your pond room is consistently above 80% humidity, then you should do fine with grow lights. I seriously doubt Jene's will have mangosteen, they pretty much stay out of the more rare varieties. Frankies in Hawaii may have some grafted ones. Ong's in San Diego may have some seedlings larger than 4".

No one can keep them long enough to develop any size. PR is now requiring phyto certs to most states unfortunately. Something the gov't thought they were missing out on I guess. Kind of screwed everyone there.

Now and then you will come across some small plants on Ebay. They don't last long. Hopefully the seeds will germinate. Just remember humidity humidity humidity.

Jay, have you not been able to keep the alive in your greenhouse? I was thinking of buying some seeds from fruitlovers.com if none of the ones I get from you and Lycheeluva sprout. They say the ship them fresh out of their fruit in damp peat moss so I would imagine they would have a good germination rate. If they are just going to die anyway I may not waste the money. Can these survive outside in FL in the summer/spring? I am pretty sure I coud get them throught the winter in my pond room but do these things need a greenhouse even when temps are ok outside just to keep the humidity high enough?