I have been getting my pictures printed at Sam's Club for years and have never had any issues with them. Now the smallest size they do is 4x6 with a slight pebbly finish. In other words not the smooth shiny finish you can get in other places. What type of finish never mattered to me, just the color quality.
Sharon My Gallery
Goal 2017- 64/200 layout (40/50 cards) J/29, F/25, M10