I believe it depends on your state. I'm in California and I had to pay $10 for freezing on Experian and TransUnion, although it was free for Equifax.
It's mildly interesting how different the experience was across the three. Experian gave me the choice between choosing a PIN and getting a generated one, Equifax just gave me a PIN, and for TransUnion I had to choose the PIN (shorter than for the other reports) myself.
https://www.freeze.equifax.com/ https://freeze.transunion.com/ https://www.experian.com/freeze/center.html
You and your wife just did it 1 minute apart...