Where can I get 1 1/2" dust collection adapters and such?

Some of my tools (Ryobi belt sander, Milwaukee orbital sander, DeWalt plunge router, Bosch planer) all come with dust collection bags which generally get full very quickly, and are not effective in keeping the machine clean (or semi-clean) of dust. I figure that if I could connect them to my dust collection system (2 1/2”), they would be more effective at removing dust and keeping the machine clean.

As much as I have tried, I cannot find a source where I can purchase reducing adapters or 1 1/2” hoses with adapters to connect to the 2 1/2” dust collection system I have put together in my garage shop. Do any of you fine people out there know of a vendor that sells this kind of thing to the public?

I have tried Amazon, Rockler, Woodcraft…

Input is much appreciated.

-- Adapt, improvise, overcome