Tonight's bedtime Conversation Starter: Cutting Coins

          Press these coins three times right on the president’s nose and the blades pop out.  Next, you throw them out into the yard.  These little guys will now zip all around, cutting every blade of grass they come in contact with, until the lawn is complete.  The Cutting Coins last as long as they are valuable.  For example, a penny works for one year.  A quarter works for 25 years, etc. Now with just one allowance, your lawn will be cut for at least half of your life.

Brilliant Little Bedtime Conversation Starters
How much would you be willing to pay for these coins?

If it was your allowance used for the coins, which coins would you choose to get the job done?