Yeah, I was talking about Amazon, I ran a brief search on Amazon for things like “Right angle plug [or outlet] adapter” and saw several cool options. Many looked even more flat than the one posted above. Some are also outdoor rated themselves.
I’m surprised none of the other stores you mentioned had any…you’d think it would be something Lowe’s and HD would carry! Hopefully you can find a good solution.
Though, I do agree with you that all things being equal cost-wise, it would make much more sense for an outdoor plug to be right-angled.
Other options too if something else would work better for you, but some of those are less than $3 per plug, which is not bad.