We purchased the A100 for our 3 yr old, and want to know if there is a way to lock his ability to purchase apps on his own. I have a android marketplace acct, and don't want him accidentally buying a cool app that will be pricey!!! We also bought the A500 for our 13 yr old girl, and while I am not as worried about that because like me, she likes the free, and will only shop if she has a gift card to shop with. Thanks in advance for any help!!!