You are having a giraffe if you think she may say no.
Hello Honey/Chick/Babe/Dearest, Theydon deared me to buy a comics that costs £100 from the shop, can I buy it, pllllllleeeeeeeeeeeaaaaaasssssssssseeeee?
If your missus is anything like mine, she will have no idea what I paid or be able to read these forums to see that I have been lying. But even telling her it cost £2.50 would be 'a waste' so I couldnt win that way either.