I found a broken, untested backwards compatible PS3 model online which ended up costing me just 11€ and it ended up working! It needs a shell replacement but besides that it works
Is $354 worth it for a used PS3 today? : r/PS3
How do I softmod my PS3 Slim while BG Toolset is down? : r/ps3homebrew
Console Modding: What are the benefits of jailbreaking the PS3? - Quora