1958Direct via Amazon offers eight 1958LLC Replacement Heads for Oral-B Electric Tootbrush for $16.99. Coupon code "GCPKYQ77" drops that to $8.99. With free shipping for Prime members, that's $8 off and tied with our July mention as the lowest price we could find. Each brush head is good for 6,000 uses.

Note: These are third-party replacement heads, not Oral-B-branded units.