And no, I think I do have the right to be annoyed, because she tells me she can't afford it, then she goes and spends $167 on stupid crap like seat cushions and the rug.
While I think everyone has the right to be annoyed because everyone is entitled to their own feelings, I don't think you should be mad at your mom for this. That is HER money, she works for it and it's her desicion to decide how she spents it. As a parent it's her job to give you the things you NEED not want. So you shouldn't be upset because your mom doesn't want to use her money to get you something that you want because she wants something for herself. You mom deserves to buy the things that she wants with her money.