Probably because you are in prime listed shows. Regardless, the answer is yes. Yes you can buy them if you look them up directly through amazon, and not just amazon prime. https://www.amazon.com/Immolation/dp/B07BNSXPXP/ref=sr_1_3?ie=UTF8&qid=1526945537&sr=8-3&keywords=the+expanse+season+3