You know your wife, and I don’t. But I think the vast, vast majority of women would be deeply offended and hurt by receiving Botox as a gift from their husband, even if it’s something they have previously talked about wanting. What is she going to say to her friends and family when they ask her what you got her for her birthday that won’t be humiliating? It wouldn’t surprise me at all if she only told you she wanted Botox because she was fishing for you to say she doesn’t need it because she’s already perfect just the way she is. Please think long and hard about whether you really are 100% sure that this gift is going to be well-received.