Gawd 'elp me!

I'm in big trouble, big, big trouble. So big, you guys had better get your ear plugs inserted.

I have to go my wife, and say "Babe! I just went and screwed up my helmet, and it was about four years old anyway, and the guys at Bike Forums say I need to replace it."
She'll say, "But sweetie, you just spent 'a' on a new bike, 'b' on new shoes, 'c' on new pedals," rising crescendo "'d' on a Camelbak, 'e' on a bike lock, 'f' on tools" now increasing in volume "'g' on maps, 'h' on a bike rack, 'i' on mtb shorts, and now," screaming "you now want to spend 'j' on a new helmet. Did I actually hear you correctly or do I have wood chippings in my ears?"
To that I'll meekly reply "Yes. It was the Bike Forums guys. They're the ones who suggested it."
"What is this?" she'll spit, "a charity or something?"

So what do I do? Buy a new helmet of the same shape, size, and colour, and hope she does not spot it?