hey there how are you?, i send you this bind first, but as far as i can see you are really dont tell so much about the project, those sprites are already done? or in how resolution do you need them and what tipe of art too, is it a vector image or hand made? or pixel art? as you can see in my porfolotio i got some experience working with this kind of assets; it´ll be a pleasure to work your your project. but the time and money to pay will depend on really how much work or time i would have to spend on it.
I hope you have a good day.