I have a question about samsung displays

Hi! I would like to do some more samsung repairs . I worked on iphones before and recently bought a galaxy s8+ with a cracked screen . I failed to change the glass and put a black dot on my screen . No problem , i just replaced the screen at a local shop because they had good prices . Now i would like to know if samsung sells replacement parts , especially displays . I saw displays with the Samsung logo and a Service Pack text on the box .From where can i buy them ?Thanks !