Look on e scam bay. I got a set of 6 teeth and 6 shanks for a bit over $100. Depends on what you get, there are cheaper ones. Small bucket like yours should only need 4.
If your bucket is like mine, it's designed for bolt-on type. Part # 75590-42572
I got some from tractorsmart about two years ago. $21 a pop incl. shipping.