It cost us $200. That was for a one hour session for dh and me with a sw. We are using a clinic donor, so we didn't have to pay for her session/eval. Even that burned me, though. I've seen numerous therapists and I've never paid that much for a one hour session. Plus it wasn't even that helpful. But it pales in comparison to other de costs, so I let it go.
900 sounds ridiculously high. are you using an agency donor? Wouldn't the agency have taken care of the donor psych eval? Why would you have to pay that? or are you using a known donor?
Anyway, good luck!