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Amazon [amazon.com] has 18-Count Purina DentaLife Daily Oral Care Dog Sticks (Large Chews) for $5.99 – 5% when you check out via Subscribe & Save = $5.69.
Shipping is free with Prime or on $35+ orders.

Subscribe & Save
5%: $5.69
10%: $5.39
Add to next delivery [amazon.com] (with free shipping)