A variety of Oral-B toothbrushes are on sale for $3.99, buy 2 get $3 ECB. The deal can be done twice.
Buy 4, use the $6 off (4) Crest/Oral-B digital manufacturer coupon in the app.
Total comes to $9.96. I rolled ECB.
Get back: $6 ECB and $4 Ibotta (this is also part of a bonus)
Caution: scan at the Redbox. I went to two stores and some of the toothbrushes were on clearance although they are tagged and show on the website as $3.99. The Sensi-Soft was $2.34. If you find 4 of those, it will be a small MM using the $6 coupon and Ibotta. Remember clearance does not earn ECBs.