AINOPE US via Amazon has Ainope 54W(18W QC 3.0 + 36W PD) Car Charger Adapter for $17.98 – 10% off when you clip the coupon on the product page – $7.19 off when you apply promo code 408L5NIN at checkout = $8.99. Shipping is free w/ Prime or on orders $25+.
Note: Coupons are usually limited to one per account.