Brownie931

I’m having an issue now with my 2015 Sierra. Code reads cylinder 5 misfire. I’m at 118,000 km. It’s not considered power train so no warranty. The quoted me 1890.00 plus taxes for all 8 injectors. I service my truck more than gm recommendations , shouldn’t have this issue. I was thinking just to replace the one that’s bad but only $500 more to do them all and be done with them. could I save money by going elsewhere to an independent garage?