After research and advice here, I only buy Shimano stainless inners and Shimano SP41 outer..
In any event I only use Shimano. It's a known quality and with brakes especially, even as a tightwad, I'm pretty keen on quality. The faff factor means that any price saving on cheaper stuff doesn't appeal. I tried Jagwire on my MTB and really didn't like it, especially the outers.
I usually find myself buying from Merlin as they often have some good deals if you aren't in a rush and keep checking.
I live close-ish and can swing by to collect to save on P&P
if you are not fussy about stainless, they have gear inners on for £1.50 (when buying 5)
https://www.merlincycles.com/shiman..._medium=Affiliates&utm_campaign=genieshopping
The last gear outer I bought was from
eBay I bought about 10m and chop it off as I go.
I have also found buying brake cables and inners together as a set can be cheaper on eBay.
But I only buy them for my lads Frog as I'm hydraulic so was able to make a rear set do the outer for front and rear..