I have a burton 125 that will fit your son. However, you'll need new bindings for it and you can find those in a forum or ebay and get them used vs. new...
I can send you pics. Just email me at
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and I can get them to you. Right now there are Step In Bindings on the board however they are for a larger foot as our son has HUGE feet lol.
So, I would be willing to sell you just the board for 30.00 plus shipping!