"Ariel, don't you mean first-party retail websites?"
What, you mean HP? They have a parts store, yes, but they either discontinue or run out of the parts most likely to break, even before the laptop models those parts are used in are themselves discontinued.
Sorry about your screen breaking. Yes, we know you downloaded & read our service manual, but we're all out of replacement screens. Would you like to buy a replacement SSD instead? How about a replacement power cord for your power adapter?