So, fans die every once in a while. Other than EBay, where's a good place to find GPU replacement fans? Preferably a place where the cost doesnt make it tempting to just buy a replacement card & sell the one with faulty fans for parts?
You can try aliexpress. I ordered several items
(not GPU fan but other laptop parts and other items not available in my country) there and didn't have any issue with the items, delivery is also prompt (usually earlier than promised).
https://www.aliexpress.com/w/wholesale-graphics-card-fan.html