Price: £3.96 & eligible for Free UK delivery on orders over £15 with Super Saver Delivery. See details and conditions
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For £4, anyone with school-aged children, or just as general reference, couldn't go wrong with this.
"over 68, 000 articles, over 25, 000 photos and illustrations, over 300 videos and animations, over 2, 500 sound and music clips, and an interactive atlas with over 1.8 million map locations"
Engage learners as young as seven with pictures, games, large icons, and a simple, colorful interface that encourages exploration. Childrens Encarta is designed for use with Key Stages 2 and 3 of the UK National Curriculum."