Amazon.com has as an Add-on Item: Casio Men’s F-91W Classic Digital Sport Watch for $5.86 on any qualifying $25+ order (details). Shipping is free w/ Prime or on orders $25+.
https://www.amazon.com/Casio-F91W…5706720I
Walmart also has it for $5.74 after pickup discount. Choose Walmart as the seller and use store pickup for reduced price – https://www.walmart.com/product/20670078/sellers