CRS504 Switch...
If you’re hunting for a better deal than MSRP, eBay is often where these higher-end MikroTik switches show up at more home-lab-friendly pricing. The CRS504 is still a niche device, but for a 100G core switch or a breakout-based 25G fanout, it can be worth watching listings for.
You'll be taken to Ebay to complete your purchase.