It's nothing but a standard USB-A extension cable, male-A at one end and female-A at the other, maybe 3 or 4 inches long. If all else fails you can probably find one locally. I use one several feet long to move my Roku stick through the wall and into an equipment cabinet.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T