Hey Danielle! I was lurking over this way and I can tell you a reversal will be a lot cheaper if they are wanting to use husbands sperm, if they are going the route of donor sperm and IUI, I don't know exactly the cost of the donor sperm but I know here where I live my doctor charges $200 for the IUI.
We paid for DH's reversal $8000 but it could cost that to do a biopsy and retrieve his sperm. I would definately have them talk to her doctor about it and see what route he would suggest that they take.
In our situation it was going to up our chances and cost a lot less to do the reversal than the IVF (and to tell you the truth using donor sperm and doing IUI wasn't even an option that my DH would consider

Said he would feel that its MY baby and not HIS)
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Raquel Mom to The "A" Team: Anthony, almost 10yrs old (OMG double digits!!!!), Alexis, 8, Aiden, 5
Missing our Angel: Aries Isaiah 09/06/05 Carried you for only 24wks1d but in Mommy's heart FOREVER
To my Aries:
The time we had with you was brief,
We had to say good-bye,
Now angels kiss your little face,
And sing your lullaby.
Someday again, we'll be with you,
To cherish all those things,
Until that day it helps to know,
You're safe in angels wings.