Need some advice

So I'm new to the forums, I actually just joined because my husband and I are going through this issue at the moment. We are a family of 4, my husband and I, our 2 year old daughter, and my husbands 14 year old sister that we have had custody of for a year and a half. We have been together for 3 and a half years and have been moving around every few months because my husband works contract jobs. We just got to the point a few months ago where we are ready to stay in one place and buy a home. To move closer to this goal I gave up being a stay at home mom which I loved and went out a got a job, the problem is that now my husband has gotten used to having that extra income and has changed his mind about saving up so we can get a house. He can't seem to under stand that going out and buying small things ads up. Our disagreement at the moment is that he wants to buy an exhaust for his car along with getting his windows tinted. He also wants to take a conceal carry class and buy a holster for his gun. I'm trying to explain to him that these things don't fit in our plan right now and that I think the best thing would be to save up a set amount of money that we agree on and then after that gold is reached he can start using extra money we have to buy some things that he wants. He agreed with that earlier tonight but then as we were getting ready for be he told me he doesn't need to ask my permission to spend money and he can buy what he wants. This isn't something new, he has been think this the whole time we have been together, I guess I was just hoping since we were working toward a mutual goal and since I went out and got a job that he could at least wait to buy the things he think he "deserves". I'm not sure if this was more of a rant or asking for advice but any input would be appreciated.

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