Vudu often has sales on older Starz series. They offer an "SD" tier, which is exactly 480p. You can download the episodes to your device via their app.
For the best viewing experience and to avoid the security risks (malware/phishing) associated with unofficial download sites, you can access the series through these platforms: spartacus season 3 all episodes download 480p
– The rebel army splits, with Crixus leading a faction toward Rome. Vudu often has sales on older Starz series