Can't you just say you bought it? I wanted something it was a lap top computer and my husband said you have a computer, but I wanted the lap top, so I said to him as he was restoring his old VW " well you all ready have a car"
needless to say I got my lap top.
Not to mention our money starts with two of us and you have as much right to the money as he. hat is another thing I ask my DH "Why do you get to decide what is to be bought?"