Do you realize how sad that sounds? My wife gave me permission to do something. Weak dude. It's one thing to say that money is tight and we have to be frugal as a family with our purchases, but to say that you have to get permission from your wife to make a purchase sounds truly sad and emasculating.
Being that you have "permission", buy it before she changes your mind.
YOu must be young or singel, anyone who is married will know exactly what the OP was talking about. And believe me it have nothing to do with being "emasculating", the fact the he share the decision with his partner about a $500+ purchase says a lot about himself and about his relationship