Limited stock. ebay with vipoutlet has the open box Apple Watch Magnetic Fast Charger to USB-C Cable (1 meter, White; ‎MT0H3AM/A) on sale for $6 = 10% off with coupon code VIPOUTLETMARCH [Exp 3/31] = $5.40 with free shipping. 

Supports fast charging on Apple Watch Series 7 and later and Apple Watch Ultra models.