Rather than waste money, advise your son to trade on a simulator. If you have a broker and trading platform, you probably already have access to a simulator. Or you can use a free one like at Investopedia
http://www.investopedia.com/simulator/
Trading penny stocks for a beginner is just silly, no matter how much money you have. You want good solid stocks, not problem stocks.
Because you have little money is not a reason to trade pennies. One share of Google is a better investment than 500 shares of a penny stock that won't be around tomorrow.
Google the terms "pump and dump."
If you are a new investor i would advice you to stay away from penny stocks but if you have patience for very long term then you should invest some extra money of yours in penny stocks.
Plus 500 is it a good place to start
You cannot realistically buy shares for less than £100; I would suggest £500 as a minimum. The main reason is buying and selling charges would mean that you would need a huge rise in the price to begin to make any profit, and that is assuming that you were lucky enough to pick a winner from the many available. You really need to take the time to study the share market workings, before you indulge.
Do you and your son still believe there is a pot of gold at the end of the rainbow? It will prove more profitable to go looking for that .
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Hi my son wants to buy a few pounds in penny stocks , i suppose it wont harm him , so i offered to buy them for him ( i didnt think he is old enough) , any sites where i can just buy about £1 or £2 in penny stocks?