I've seen uninstalled samples of the Bot's Dots both the round and reflector versions. They are thin enough, and flexible enough that you can fold them in half by hand. What makes them robust it the dollop of adhesive that fills it. I'd bet that dollop of adhesive costs more than the reflector.

The other thing about Bot's Dots is the speed at which they are installed. A specially fitted truck runs down the road at near freeway speeds pasting them down. And they are proof against traffic immediately.

Also they are not installed everywhere in the US. One of my remote cousins, after seeing them for the first time, asked if the local winter fogs were why they were installed.
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Glenn