I've periodically checked to buy a raspberry pi for ~2 years and they are never in stock. I'll have to go a different route.
I just run an Umbrel node, and they have an app for running a private relay. It's made from a raspberry Pi 4 8GB, and a 1TB SSD. You can check out their website here: https://umbrel.com/
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Yeah I feel you. I bought my setup about 2 years ago. Since then prices for all components (except for the ssd) have gone up in price.