Where Do You But Fabric?

So, I am going to reupholster these chairs to match a black round wooden claw-foot table.

But I don't know what fabric to use and where you get it.

Here are my ideas:
-it must be black and white
-I was thinking about that uber popular zigzag pattern
-maybe another print, any suggestions?

Where is the best/cheapest place to get good fabric like that?
Help me, please and thank you!
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