if i remember correctly, a new 118i is around 185k. Did you check for discount on new units, 2018 un-reg or pre-reg units with the BMW dealers?
The current 118i sold is M-sport variant and is quite well specced.
Not sure about the 2017 model.

For 2015 unit, check if there's still warranty. I can't remember when they transitioned from 2 years to 5 years warranty