How can i convince my parents for a hedgehog?

So I am 14. I am obsessed with hedgehogs. They are my favorite. I have two dogs. I do take care of them. Only one of them is really my dog. I’ve been asking for a hedgehog for a while now. I’m even saving my money myself to get myself a hedgehog but my mom will just shut down my offer when I want to pay for it and the must haves. I do understand hedgehogs need a lot of attention to get used to the owner or just in general. I’ve done a lot of research. Is there any way that worked when you wanted a pet when you were little but your parents just were not getting it?