I just bought three sets of these (6 cubes!) for £18.92 including the postage at £3.95 which seems like a pretty good deal to me (Xmas shopping done!).
They also sell the large cubes Global Get Away / Blockbash for the same price (£4.99 each) and the postage is always the same regardless of the size of your order.
Cube World - Where Stick People Stick Together
Stick people stick together. Play with one or build a world, they'll play, visit and interact with each other. Play games and pester them, tilt the cube and an interactive motion sensor will cause the stick men to fall on their side and upside down. Build a world. Stack 'em for an interactive block party! Stick men will interact and visit each others cube...
Each cube requires 1 x CR2032 battery (included)
Cube dimensions (W x D x H) 47mm x 47mm x 47mm