Need to put Mac back on.

I'm not sure if this is in the right section but, I accidently removed Mac off my computer and now I have to run linux. I do not have a Mac OSX CD, I know someone who does have a retail one and can help me, but he's been busy the past few weeks. Is there a way that I can download a Mac ISO and put it on a CD? Help is much appreciated. I do not have access to a USB thing FYI. I don't actually have any cds either but I can buy them. Also, what is the correct CD to buy if I can do this?