I worked at a bowling alley for 12 years. 6 pounds is the lightest. Most bowling alleys do sell bowling products and it is better to support them than some huge sporting goods chain. Besides, they are the ones who will drill it! Buying it somewhere else and then asking them to drill it would be like bringing your own food to a restaurant and asking them to cook it for you!
In our local alleys they have a frame for the young children to use. The frame is in a shape of a slope. You place the ball at the top and the child pushes the ball. The ball then runs down the slope and on to the alley. Sorry I can't remember what the frame is called.
I don't know the lightest weight available but the only place to buy that sort of stuff in my town is at the shop in the bowling alley.
The lightest ball is a 6lb. ball. You can purchase them online, bowling alleys or even Sports Authority and other sports stores. My children love bowling. It is great family fun for all ages!
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