One of my friends set up Proxmox on a Lenovo M93 he got on Amazon and runs Home Assistant, Pihole, and some other things off there, and I seriously seriously want. I've been curious about hypervisors since we went over them in class, and seeing his interface hit my 'yes now' button.
What do you use yours for?
Watch Vilros and American Raspberry Pi Shop; that's where I picked up my Zero 2 and second Pi 4 8GB respectively. I tend to like Vilros better; they're fairly consistent in regularly getting stock, you just have to check in consistently to catch it. The Zero 2 was an actual fluke; I was evangelizing about the Pihole to a friend and went to the site to show her what to buy and the Zero 2 was right there.
Canakit's good too, but somehow, I am always coming in right after pre-orders close, which is weird, as the one thing you cannot say about me is I am not focused as hell (the COVID Switch and NVIDIA Shortage was very educational on how to stalk merchandise into submission).
Truthfully, for a Pihole, you really don't need a Pi 4; my Zero 2 runs it with resources to spare (the regular zero technically could, but there was more than one bottleneck).