Cats spraying

I have two unfixed female cats. I’m working on getting them spayed but I can’t afford $300 per cat right now as I’m out of work.

I’m due may 21 and I’m worried about the cats spraying the pac n play if it’s left unattended. And I’m really not trying to move it from bedroom to living room every day.

We are also moving homes June 30 and I want to do everything in my power to keep them from spraying the new house.

Please help. Is there anything I can do before spaying them as a last resort?