The 3050 is socketed, yes, but AFAIK, you can only run the i3-9100T/i3-9300T/i3-8100T/i3-8300T on it with Libreboot. IIRC Francis said somewhere that you could, in theory, run other desktop CPUs of the same generation but you need to do some board modification. Not sure if it has ever been done in practice. The M910q can also be corebooted if that's the type of thing you care about. As for where to get them, Ebay? I'm looking at listings for a i3-9300T for $45 and i3-8100T for like $15-20. You might want to also consider an M920q, it has 8th/9th gen CPUs and an 8x PCIe slot if you want to stick a small form factor GPU in there to game on +++ coreboot.