Where to buy new Canon Pro-100 printhead ?

i believe my printhead is shot. it lasted at least 9yrs, I didn't print a ton, but It was used every other month or so lightly at least for 9 yrs. Doing cleaning cycles made it stop flowing on the M & Y colors. I found an eBay seller in Hong Kong who sells , so he claims a new Canon Print head for $159.00. I'm little leary. WHERE is the most reputable place to buy a Canon Pro-100 printhead ? I can only find 3rd part printheads compatible , and all have 1 star reviews, if any. help .