Replying to Parents won't let me buy my own skis

I have been skiing for 10 years, but have been taking it a lot more seriously over the past 3. I'm 16, and recently I've really wanted to get more into the park. Every year I've got the same old season rental skis that get the job done, but are terrible in powder and the park. I can still do rails, 180, and some easy grabs. I've told my parents I've wanted my own set of skis that can rip the park and moguls/steeps but they've always told me my rentals are just fine. I ski pretty much every weekend. Anyways I just got back from an argument with them about getting my own skis. I want to get a pair of Atomic Bent 90s, as I have demo'd them and LOVED them. Issue is, my parents said no, and want me to wait until next year - But I want to take the park more serious and using Stiff and Skinny rental skis won't let me do that. Right now they are on sale (as they are the 2024 model) and at a very reasonable price, and I have offered to pay for them as I earned plenty of money from my job that can handle a purchase like this. Still, they say no, and so I am just debating on whether I should just pull the trigger and spend about 500$ for the skis, some marker squire bindings, and mounting service, or listen to them. I feel like they just don't understand. Any advice is appreciated.