For someone who has the money and would give it a good home:
Hybrid Theory 2-song sampler promo: https://www.ebay.com/itm/Linkin-Park-Hybrid-Theory-Extremely-Rare-Promo-CD-with-2-singles/373170324223
SD and Friends?: https://www.ebay.com/itm/SD-and-his-Friends-Chester-Bennington-Linkin-Park-RARE-1993-3-Song-Cassette/184359197204
Does this community even have MP3s of SD and Friends? If not, maybe we can all band together and buy it and rip it to share? I'm willing to contribute towards this if everyone else is as well.