I have no idea what T's go for in other parts of the world, but there was just a posting last week in Los Angeles for a 5" B. Smithi for $90.00. I would have loved to jump on it but my wife is still on the fence about T's in general.
*puts pinkie to mouth*
But seriously lol....
It could easily be 6in at 3 years. I had a vagans get 6in in barely over a year(HEAVY feeding/male).
And I think bobusboys quotes are way too high. Canadians typically must pay way more for T's than you would, seeing as you are in Cali. I'd say you could get one for half those prices or less. Just put a WTB up in the buy/sell/trade section and see what pops up. Good luck.