The movie "Big Stan" (2007) can be watched on several streaming platforms. It is currently available to stream for free with ads on The Roku Channel, Fandango at Home Free, Amazon Prime Video Free with Ads, and Xumo Play. It is also available for free streaming on Hoopla, Plex, Plex Player, Plex Channel, and Fawesome. Additionally, it can be rented or purchased on Amazon Video, Apple TV, and Google Play Movies. There is also a full version of the movie available to watch on YouTube for free. To summarize:

• Free streaming with ads: The Roku Channel, Fandango at Home Free, Amazon Prime Video Free with Ads, Xumo Play, Hoopla, Plex, Fawesome
• Rent or buy: Amazon Video, Apple TV, Google Play Movies
• Free full movie on YouTube

This should provide several options to watch "Big Stan" depending on preferences for free viewing or purchasing/renting the film.