Amazon has Oral-B Pro-Health Stages Manual Toothbrush – For Kids for $1.37 after clipping the $1 coupon on product page. Shipping is free for Prime members if you use the Alexa ordering method or free with $25 of Amazon products.
https://www.amazon.com/gp/product/B019MEOSJ8
Note: You will get the Nemo version, not Dory.