Tile Backsplash Already Grouted?

Hi all, I’m hoping to get some assistance. I am looking to have a white subway tile backsplash installed in my kitchen (looking at 2x8). Someone told me about some sort of tile sheets that come already grouted that are apparently fairly easy to install. I’m looking on the Internet and I’m not finding anything that is already grouted? They said they were real tiles and not vinyl, etc. anyone know?? Thank you!!