Where are you located? Location is everything.
I live in Upstate NY where there are tons of dairies, so lots of AI people available.
I use a private service (not Genex, ABS, etc). They charge $7/animal whether there is 1 or 25. Super cheap.
If you are just thinking about getting into AI, do you have a nitrogen tank to store your semen? Have you decided what bulls you are going to use? Have you ordered your semen?
If you use ABS or Genex or Select Sire, you can order you semen through them and they will keep it in their tank, but then you are locked in to picking only bulls that they sell, because they won't (aren't supposed to) keep semen from a different stud.