L.C.
For both of our boys we got used bikes at the thrift store for less than $10(they need to be light ones, not Shwin), unscreewed the pedals off(just the top dedal part not the whole thing ) Both of our our boys learned to balance within 2 days and wanted the pedals ons. Our youngest was not even 3.
It's the most painless, stress free way to teach a child how to ride a bike.
The ammount that those balance bikes cost is crazy.