FFPMTom

I've got a 2015 Suburban that I need to change the fuel injectors on due to codes associated with the cold start rough idle as well as misfires. Had an auto shop already clean out the system and before that the dealership said that cylinder #7 needed to be replaced. Still getting the codes the engine idles rough. Thanks to all those out there who've posted videos and info on how to replace them. Problem is, there are a lot of online stores that are out of stock for these injectors. Anybody have a suggestion on where to get at least 4, if not 8 of them? Seems like there's plenty of refurbished ones though. Anybody have advice on the ones on eBay?