Price (on the day of this writing) on Amazon.com for a base-10 starter kit, featuring 100 small plastic blocks, 30 rods (representing 10), 10 plates (for 100), and one big cube (for 1000): $31.32.
Cash value of 100 pennies, 30 dimes, 10 dollar coins, and a $10 bill: $24.00.
I'm a Professor of Mathematics and a University Distinguished Teaching Professor at the University of North Texas. For eight years, I was co-director of Teach North Texas, UNT's program for preparing secondary teachers of mathematics and science.
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Mean Green Math 