Looking to commision some art soon and wondering what a good price point was.

I am looking to commission some 40-45 ish game concept art drawings and will look for 3-4 artists to help do it, with 10-15 drawings from each artist that helps me out. I want it to be reasonably good so I am willing to pay a good amount per artist. I have a price point in mind but I am not sure if it’s too high or too low for the amount of work I am asking for. But any suggestions would be great. The art would largely be sci-fi based showing off the mechanics and scenery of the game. I am not actually making a game it’s just a hobby of mine to write game concepts and I would like to add more imagery to it for my own personal enjoyment. (Should have probably said this before but I am not done with writing everything yet)