As of October, 2015, Amazon.com sells electronic countdown clocks for as low as $2.95 for the HDE magnetic digital kitchen timer. Walmart sells electronic countdown clocks starting at $8.49 for the Tatco Digital Timer. Google Play offers free countdown applications that can be downloaded and used with Android phones.
Amazon.com and Walmart.com have dozens of electronic countdown clocks under $20. Both sites also include customer reviews, which makes it easier to choose a countdown clock that is a good value for its price. The MARATHON TI080001 digital clock on Amazon.com costs $16.95 and has predominantly five-star reviews with only 1 percent of reviewers giving it one star. The Chass Countdown Clock is a similarly priced clock, going for $17.49 on Walmart.com, with one positive and no negative reviews. Many countdown phone applications are free, and Stopwatch & Timer by Jupiter Apps has over 100,000 positive reviews.