Need help in leasing a Camaro LT1 in Cali

I am having a very hard time in Nothern California to get a good deal on a Camaro LT1. I don’t have a GM supplier code and all these dealerships have a 5K markup on their Camaros. I wanted a 2022 Camaro LT1 redline edition, RS package, and technology package black color, manual if possible. I just need some help on what I can do to secure the car under $400 payment a month. I have been seeing some deals on here where they get it $320 a month I’m just asking for near $400. If anyone can point me in the right direction or maybe even a broker that can help me please I would appreciate it. Thank you for your guys help

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