Sturdy stabilisers to fit a 20" wheel BMX bike?

I have an 11 year old son with special needs. He cannot yet balance properly (nearly there) but we don't want to go to all the expense of buying him a special trike. One of our friends has just given us an almost brand new BMX bike with 20" wheels and my son just loves it, however, he cannot sit or ride on it until we find some strong stabilisers. Does anybody know if you can obtain stabilisers that are more sturdy than you would get in Halfords etc.

Many thanks,

Desperate mum!!

Answers:
I dont know where to get them (sorry) but I have seen motorcycles with stabilisers on, in use training people to controll big sports bikes.
Maybe you could look in that direction ? call a few track race-day motorcycle training schools and ask them if they know anything about them.

Wish I could help further.

Just seen theese on eBay.. maybe a thought to look there ? (copy and paste, sorry it's a long link)

http://cgi.ebay.co.uk/childs-kids-motocr.
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