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The plastic handle that fits a Stanley blade is a pretty normal option. The blade wobble tends to be less of an issue when you have pressure on the blade i.e. when it's in use.
I like the powertec ones. I have a few that don't have the soft handle. Only problem is the blades come in packs of 100 so its not for the occasional user. Having a retractable blade makes it much easier to keep in a pocket.
Ghetto style is a Stanley blade with some tape on the back edge to stop it cutting into your fingers.
Any recommendations for a window scraper. Just looking and I seem to have a whole host of cheap plastic ones with wobbly blades.