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Meritline offers the Oral-B Precision Clean Brush Head for 4-Pack for $3.99 with free shipping. At $1/brush, it's the lowest total price we've seen for Oral-B toothbrush head refills of any kind, in any quantity. (It's currently a buck under the best we could find even for one Precision Clean replacement head elsewhere.) They're compatible with several Oral-B electric toothbrushes.
AE0009004 Marquise M SI3 1.50 is also available at these stores