Yeah you're just paying a premium for not needing two cables/an adapter.
https://www.amazon.com/Sabrent-Converter-Prolific-Chipset-CB-DB9P/dp/B00IDSM6BW
https://www.amazon.com/uxcell-Male-Connector-Cable-Converter/dp/B010ESEZU8
Should be the same thing for half the price.