I found these on amazon. A good bit cheaper than aliexpress for the oil filter model, but I hear the valve cover model is better as it cools the more critical head and top end parts better. Maybe some people will use both for maximum cooling?
Oil filter model no prime but only $60:
https://amzn.to/37HAt61
Oil filter model with prime shipping:
https://amzn.to/36AkiaE
Valve Cover model:
https://amzn.to/2QsEDZv