I bought one at Isle Discount Supply about 4 years ago but they probably still have them. As I remember i was kind of spendy, like $17, but it did the job.
Are you trying to get the outlet plate that goes on the fishhouse wall, or just a cord with male/male. I got a wall plate for my fish house with a male plug on it from Menards for around $10. I can plug a normal extention cord directly from the house/generator into it. You might have to look or ask a sales person with some smarts to find it but the Elk River one has it
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Akichler
PEAK Fishing Team
(When Your Down To Nothing, GOD Is up To Something!)
We wired up a male plug on regular 110 wire and then put it in an outdoor outlet box with a cover like the one in the picture. Its cheaper and it works just as well.
This is what u need take the part # to Menards they don't stock them most of the time anymore The last time I wanted one they told me I had to order at least 8 of them.