Ebay offers Sun Joe Rotary Wash Brush Kit for SPX Pressure Washers for $14 (reg $39.99) after code with free shipping.

Apply Code: SJNEWYEAR

Product Description:
Spins and scrubs away stubborn dirt, debris, gunk  grime! Compatible with all SPX Series Pressure Washers.  
Main Features: 

• Pressure-powered for maximum results with minimum effort.
• Perfect for deep-cleaning patio furniture scrubbing cars, windows, siding, RVs - and more!
• Transfer adapter included*