How to close off a wall opening for cheap?

I'll be moving in with my sister soon in her two bedroom townhouse, but the spare bedroom has a weird opening I want to seal off. It's by the stairs so people can see in the room while coming up the stairs. It's about a little shorter that 8 feet long and a little shorter that 4 feet tall. I've... show more I'll be moving in with my sister soon in her two bedroom townhouse, but the spare bedroom has a weird opening I want to seal off. It's by the stairs so people can see in the room while coming up the stairs. It's about a little shorter that 8 feet long and a little shorter that 4 feet tall. I've looked up 8 ft tension rods but there like 30 dollars. What is a cheaper was to close off this opening?
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