can you still buy Robohelp 8?

I am currently using RH8 and won't have time to upgrade all of my projects to RH9 until after we complete our spring s/w release at the end of May. In the meantime, we just hired a new writer and I need to purchase a new copy of Robohelp. I wanted to get RH8, but when I looked at the Adobe store, it appears that you can only purchase RH9, which won't work for us. Does anyone know how we can get a new copy of RH8?

Thanks!