If you find a Finnish product or deal with a Finnish company that displays the avainlippu - Finnish for Key Flag - go for it: it'll be more expensive upfront but you'll get more than your money's worth.
Unlike other BS Made in Somewhere signs, the avainlippu really does mean quality: the Finns who display it really are proud of the products and services they offer. I can personally testify to this.
If you buy a product with the little flag affixed to it, it will be made better and last longer. Even if it's not obvious rightaway, one day years later you'll realize that thing you bought years ago that you're taking for granted is still around and still doing what it's supposed to do just fine after years of use and abuse.
Not that I know of. I encounter the telltale sticker every once in a while in stores, when products are made in Finland and sold elsewhere (if you don't know it, it's easy to miss though, as it's usually a teeny tiny thing on the product itself) or I seek them out specifically when I shop online. Like if I shop for a pair of shoes and I'm equally interested in two pairs and one of them has the avainlippu, that's the deciding factor for me.