Not to ruin my source of SBPC replacements, but HPE thin clients can be a good option. The CPU is even weaker than an RPi, generally 2-4GB of RAM, however the peripherals are better, the storage is generally SATA or NVMe so less chance of data corruption, and it's a standard BIOS/UEFI setup that will run most x86 distros no problem. I run Alpine on one as a 3D print server and it handles Klipper/Moonraker/Mainsail without even breaking a sweat. They can be obtained from corporate hardware liquidators from $30-80 depending on the model and specs.

The downside is that it won't just run all the Raspbian images that float around, which is IMO the main selling point of a RasPi: a unified hardware platform that a non-technical user can just burn an image for and go.