Watches
All runners need a watch. Running watches vary greatly in price, quality, and features.
For our purposes a chronometer is the only required feature. Memory for up to 30 laps would be beneficial, but not necessary.
A cheap watch will last a season or two of running. My $35 Ironman Triathlon watch has lasted for over 5 years. Similar models have been known to last for a decade.
Watches can be found online, or at stores such as Target and Walmart.
Below are links to watches that would serve our purpose.
Walmart
Men's Watch with no Lap Memory
Women's Watch with no Lap Memory
Amazon