I got bad news for you. This hobby’s gonna be expensive 
At this point i order at least one extra of everything that I don’t want downtime with. I’m sure I’m not alone.
Maybe you can start a shop and supply parts to your brethren in the area? 
Oh this is the battery thread, so I’ll mention, I’ve started adding solid state fuses to each balance lead, right where it connects to the p-group. A Littelfuse Pico II, 3A 125VDC. They’re the size and shape of through hole resistors and pretty cheap. If batteries are expensive to get where you are, this kind of thing might be worth doing. I bought like a hundred at 3A, and a dozen or two at 5A and 7A for charge ports.
Hm looked up my order history. The 3A ones were $0.25USD when I bought them, but now they’re up to like $0.50. Part number 0251003.NRT1L. But there are different part numbers for the same item with different packaging that may still be in the 25 cent range.