I was looking for Cross action replacement brush and found these deals. If someone finds cheaper Cross action brush heads please let me know in the comments.
Oral-B Cross Action Replacement Electric Toothbrush Heads Refills, 4 Pack - $19.49 ($17.54 S&S)
The main deal for 4 packs for $13.49 was posted previously.
Other deals with Oral B Toothbrush Heads
Oral-B Sensitive Replacement Electric Toothbrush Heads Refills, 2 Pack - $8.25 ($7.43 S&S)
Oral-B Electric Toothbrush Precision Clean Replacement Brush Heads, 10 Count - $36.95 ($33.26 S&S)
Oral-B Precision Clean Replacement Electric Toothbrush Heads Refills, 6 Pack - $23.99 ($21.59 S&S)
Oral-B Precision Clean Replacement Brush Heads 3 Pack - $12.50 ($11.25 S&S)
Oral-B EB20-2 Precision Clean 2Pk, 2 count - $8.39 ($7.55 S&S)
Refer to this link if you are unsure which toothbrush head is good for you. Thanks to User @NoiceMemes.
Hey Op, a month ago Costco had 16 heads replacement for $49.