Official Apple 20W USB-C Power Adapter (White) $16 + Free Shipping w/ Prime, Walmart+, or $25+

Amazon has Official Apple 20W USB-C Power Adapter (White; MHJA3AM/A) on sale for $15.99. Shipping is free with Prime or on orders $25+.
Walmart has Official Apple 20W USB-C Power Adapter (White; MHJA3AM/A) on sale for $15.99. Shipping is free with Walmart+ ( free trial ) or on orders $25+.
Note: Product must be sold/shipped by Amazon or Walmart respectively