Strollometer : $40

An easy way to count miles. If you're an exercise fanatic or just curious how many miles you are logging on walks with your new baby, try this gadget -The Strollometer. The device measures speed, time and distance. When your striving to lose the baby weight, this gadget will let you know just how much you are really walking off the pounds. Easy to attach, fits on all strollers, and available in Lavender, Blue, and Green. $40.

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Buy it now - Strollometer.
Strollometer on eBay - look for a bargain.