Oak Leaf via Amazon offers the Oak Leaf Bidet Toilet Attachment for $25.99. Coupon code "MFK5GPE5" drops it to $17.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $7.34.) That's the lowest total price we could find by $5. This non-electric seat attachment features adjustable spray strength.