Escape From City 17, an unscripted short film by commercial directors David and Ian Purchase (AKA The Purchase Brothers) based on the Half-Life 2 storyline, was shot on a budget of $250.
The commercial directing duo filmed guerrilla style with no money, no time, no crew, and no script. When they weren’t shooting they were hiding from security patrols in between takes. The spec project ballooned into a multipart series, and the first two episodes were made from beginning to end on a budget of only $500.
The short was sent to Valve, who in result flew The Purchase Brothers out to their Seattle headquarters last year. The second episode is nearing completion.