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Tumblr has been showing targeted ads for "FTM binders" off Amazon. They look like this:
A binder is a piece of medical equipment. If you use one incorrectly, or use a poorly made one, you can really fuck up your ribs. This article from the Cleveland Clinic talks about how to bind safely.
A $14 binder is guaranteed not to be safe. There's a reason reputable companies charge more- sometimes a lot more. They have to carefully design binders so they don't crush your ribs or make you sick.
You know how everyone says Don't Bind With Duct Tape? Don't bind with Amazon binders.