You can watch the movie Step Brothers on several streaming platforms and for purchase or rental:

• It is available to stream on Netflix

• You can buy or rent it on Amazon Video, Apple TV, Microsoft Store, Fandango At Home, and Spectrum On Demand

• It is also available on Showmax for streaming with a subscription

• Additionally, you can buy or rent it on Google Play Movies

So depending on your location and preference, Netflix offers streaming, while other services provide options to buy or rent digitally.