IUI Treatment

So me and my partner are desperate for our own baby but in order for us to do this we have to go through IUI treatment through a fertility clinic. 
Due to personal reasons my partner will only use one particular donor however this donor only has a couple of cycles left before he will no longer be available. 

My partner and I are very concerned that time is not on our side and we’re not going to raise enough funds in order to under go the treatment in time.
I have tried many other options before this but a go fund me is the very last resort.

We would be more than grateful to anyone who is able to help us please.