You can buy episodes for around $1.99–$2.99 or full seasons for roughly $19.99. Once purchased, the Amazon Prime Video app allows you to download them to your device.
If you are following the international versions, the rules change slightly. Big Brother – TV on Google Play Big Brother – TV on Google Play. Google Play can you download big brother episodes
Where to watch Big Brother US without cable : r/BigBrotherCanada You can buy episodes for around $1