I am looking for help to purchase sperm for an IUI

My name is Denise and my fiancé’s name is krystine. We have been trying to extend our family for 3 months now and have been in the process of doing an IUI procedure. So far we have been unsuccessful in the process. It has started to get really hard financially keeping up with purchasing sperm. So we are looking for different ways that could help us in our journey to becoming amazing parents.