Just do what I do PH, tell her sorry honey there's no money for you to spend right now, I already spent it, sorry...
I have to say she is very supportive of my habits. I said the other day I wanted to buy another gun, she said go buy it. I had no intention of spending money like that, and I didn't but she would have been okay with it.
We have had a lot of big expenses in the past couple of years. I moved her here from Thailand so we had the visa process and green card to pay for, along with my airfare and hers, then the wedding, then I had to buy her Winter clothing. It is all tapering off but between general living expenses and all that I have been watching what I buy.
Currently the car is getting a lot of work done since I'm keeping it instead of replacing it. It had a rusty k-frame so I took it to a buddy who rebuilt it. While he had everything apart I had him replace the lower controls arms and bushings, my transmission cooler, belts, timing belt and transmission fluid. Thankfully his price for all that is around what I would have paid for just the timing belt replacement. A little more, but not much. I just wanted everything done before Winter.
Of course since this is currently our only car, I can justify the heated gear since I will be riding the bike more so she can have the car. I'll just say, "Hey, all this gear is cheaper than a second car.
"Oh, and I bought Ural with a sidecar for the Winter too dear."