The endding takes place like 4 years later. Sango and Miroku are married with three kids. Kagome comes back to live in the past after she finishes high school and married inuyasha. Rin is left with Lady Kaeda to learn to become a woman.
you can probably buy it on the internet but if you can't find a way to buy it online you need to search for a shop with manga's and comics normally they'll be able to obtain the manga for you or they...
They ended it because the manga series needed too go on, so they finished the MANGA and inuyasha still hasn't come back, now people are getting angry and sad. i hear that the anime will come back...