I can`t afford to go to his birthday party. What do I say as an excuse?

I`ve known this guy since September or early October. He has a lot of friends that I`ve gotten to know, and we all hang out together. He is super nice and I love his friend group. However, his birthday is in two days and I can't afford to attend. I said I was going, but I have to save money for Christmas and moving. I told him I was coming but now I don`t know if I can. Advice?
Updates:
1 mo
I forgot to mention that they will be going to an expensive restaurant. That`s why I'm contemplating on not showing up bc that`s why I would be spending money lol.
I can`t afford to go to his birthday party. What do I say as an excuse?
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