Bitvae via Amazon has Bitvae 300-ML C2 Cordless Oral Irrigator Portable Water Flosser (Black) on sale for $29.99 – $5 when you ‘clip’ the coupon on product page – 20% off when you apply promo code 20NEF4DA at checkout = $18.99. Shipping is free w/ Prime or on orders $25+.