There are a number of places to buy them, I can't speak for the quality myself but owndoc is mentioned a lot on this forum and they are reasonably priced. They also have a lot of information about the entire process so they will begood resource if you are trying to learn more about it.As far as what is best to use in conjunction with needling, things that increase collagen production like vitamin c andretinoids. Some say copper peptides as well, I'm on the fence about them myself and trying to learn more and how they interact with vitamin c.