Beware the 18" wheel bicycle, the tires and tubes can be hard to come by.
You will need to bump your budget if buy from the LBS, at least $160 and probably around $200 for a true BMX. But the bike wil be assembled,and there will be service after the sale.
AND
Is he looking for a BMX or do you just want a simple bike(one without gears)?
What is his inseam? This is a bigger factor for fit than his age.
My recommends:
for the money: Giant Frantic or Specialized Hotrock 20" $160ish These are really what you are looking for.
More money, tougher bike: Giant Modem or Rhythm, Specialized Fuse, or a Redline Raid
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