I had a look for another one for mine so that I could leave it under the sandpaper on the sanding attachment without having to peel the paper off the velcro to remove it and it was $10. Still more than it should be but it is a Fein and nothing about them is cheap. Maybe if I had gone to checkout there would have been different, as when happened when I went to buy a 12mm collet for my Hitachi.
I had an equivalent of the HF tool and it lasted for several years of occasional use but it vibrated more, needed a tool to make blade changes, and got too hot to hold if it was on for a while.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.