I found this laying around while cleaning up. I never got it to work with my old laptop (Alienware m11x). Don't need it anymore
https://www.newegg.com/Product/Produ...82E16820104357
https://www.kingston.com/datasheets/khx21s12p1k2_8.pdf
Asking $20 OBO shipped. I don't know what a good price for this is -- it's older tech but the cheapest 8GB kits at this speed on Newegg is 70~ I'm willing to go lower if this is just unreasonable (I just don't know)
Caveat is that I can't help you if it doesn't work -- I have no idea why this never worked on my old laptop. I have verified that it at least posts on my current laptop (an Alienware 13)