I have an off brand 3d printed one that I can’t recall where I bought it but here is a link to the same one.
Dust Boot for the Shapeoko 3 CNC Affordable Dust Collection | Etsyk_CjwKCAjwh5qLBhALEiwAioods2DTZ3hbza_iBSmUpLVEyOoqp1OnIinMM2URA1pFsPjAFXMtd_7jIBoCjvgQAvD_BwE_k&utm_content=go_12573075997_120353245100_507798364470_aud-318222619806:pla-295604191622_m__692713794_117122079&utm_custom2=12573075997&gclid=CjwKCAjwh5qLBhALEiwAioods2DTZ3hbza_iBSmUpLVEyOoqp1OnIinMM2URA1pFsPjAFXMtd_7jIBoCjvgQAvD_BwE
Used it for about 3 years now and works great. My only complaint with this version is each time I have to change bits I have to back out the set screws on plate and pull it off. Only takes a few seconds but if you change bits alot it could become annoying. They make a version like mine that uses magnets instead of screws for that base plate which I feel would be better.
Also make sure you get the correct version of whatever you buy based upon your machines z axis.