Here are a couple of links to help build your own. In a quick search, I did not see any commercial units that are capable of handling 100 W transmit power, but I would be surprised if there are not some available somewhere...
https://www.nutsvolts.com/magazine/article/filter-design-software
Broadcast Band Filters good for over 100 watts at
https://www.kf7p.com/KF7P/Morgan_Filters.html
or
https://www.dxengineering.com/parts/dlw-fl1718
I've used both at various times to cut down AM Broadcast interference.
Mark K6UFO
The company I worked for has used the DX engineering brick wall filter (when it was hand built by the designer) for installations of military radios that were suffering from proximity to an AM station. It was a 150 watt radio and mostly used for digital comms. The filter worked very well.
You also might look into notching the worst offender. A series cap and inductor to ground works.
73
Steve KD2OM
