@margiemdh Thanks for reaching out!
Unfortunately, we do not have replacement rainflys available for any of our tents. Is the rainfly for your tent missing? Or does it have another issue? We have several conversations here in the community that may help you bring your rainfly back to life if it has lost its waterproofness or has become sticky, tacky, or is flaking off. Take a look at this conversation, Replacement Rain Fly: Half Dome 2 Plus, and see if that contains any useful information.
Hopefully this helps, thanks!