Woot offers Greenworks UNIVERSAL GUTTER CLEANING KIT for $16.99 (reg. $49.99) free shipping with Prime.  

Product Description:
Green works universal gutter kit includes universal adapter that fits most major blower/ vacuum brands. Features an 11' reach, & tubes can be added or removed to achieve desired height. Quick & easy to assemble!

• 11 ft. Reach gutter cleaning kit
• Cleans leaves and debris from gutters
• Designed for maximum air flow
• Fits 60V 80V of blower/ vacs ( more than 450CFM) up to 5-inch diameter