Step 1: Shake it, BREAK it!
Step 2: Cheap Parts!!
1 - Ultra Bright white LED, great for throwies. (approx. $0.99 ea @ RadioShack)
2 - CR2032 batteries, useful for throwies or replacing the battery in your car's remote. ($1.95 ea @ WallMart)
And assorted other parts like a small circuit board and a magnifying lens, etc. that I'll give a cumulative value of $0.50 just to round things out nicely.