Parker was under $80. Best $80 I ever spent on my boat. After kissing 6+ Pancake Weights last spring. Along with all the other gear and 250 ft each time of braided line. They have gaurds for 8's and 9.9's.
I was so proud of not dropping a weight in alomost 8 years till the prop got involved. Oh well..... problem fixed.
Go with Mac's Prop Guard. They make a specific size for a Yamaha 9.9T (Model 3).
Easy to install, won't let you down. Some times you see them on CL for $ 70 - 90
here's the site:
http://propsavers.com/Prop Saver Prices.html
Good Luck