In all seriousness, if you do not consult your SO on purchases like this, you are just plain rude. Not that you need approval for everything, but it is just considerate to let them in on knowing. We are talking about non-essentials here. I have been married 16 years and neither one of us spends a significant amount of money without at least mentioning the intent to the other.
Secondly, if there is something Apple-y that I want, I start mentioning it when it is announced and before it ships. My wife doesn't really care that I want the new Apple product - she expects it actually - but I have found that she doesn't like impulse purchases. If she knows about it for a few weeks, then in her mind it is not an impulse.
I am pretty lucky in that cost is not really an issue and my wife couldn't care less about technology as long as it works. I will start talking about some new Utech item and she will hold up her hand and ask, "How much?" LOL!