Plastic collar stays suck. We all know this; they bend, they warp, and sometimes they don’t result in an immaculate collar, which is the point in the first place. Also, given that collars generally come in a range of sizes, sometimes your stays are too short, or too long.
Cleverfit ($60 for a set of four—but their Kickstarter has discounts) solves all these problems. They’re metal, they come in a case, and they adjust enough to even manage collar widths popular in the 1970s.