Gift ideas for boys 7-9 years-old?

My family and I "adopted" and orphanage, in Tijuana, Mexico, for El Dia del Ni�o. We need ideas for what kind of gifts to buy five 7-9 year old boys. We want to get them something that is not electronic (because they won't always be able to buy batteries and stuff). If you could give me ideas of what boys 7-9 years-old like, that would be great. Thanks.