Maker Shed is having a huge clearance sale right now on kits. For instance, the Blubberbot, an inflatable autonomous robot kit (shown here), is selling for $49.95 (regular price is $99.99). The cool telekinetic pen magic trick, regularly $14.99, is $5. And the Bare Bones Arduino Board Kit (a full-featured Arduino clone), regularly $19.99, is selling for $12.50.
(Disclosure: I am editor-in-chief of MAKE magazine.)