Walmart.com has Google 18W USB-C Power Adapter w/ Cable (GA00193-US) for $14.54. Select free in-store pickup where available, otherwise shipping is free on orders of $35+.
Note, availability for store pickup may vary by location.
Amazon.com has Google 18W USB-C Power Adapter w/ Cable (GA00193-US) for $14.54. Shipping is free w/ Prime or on $25+ orders.