Decent price, use subscribe & save to get a further 10% off to $16.20. Previous deals.
Free delivery with Prime, $39 spend or subscribe & save if you already have an active subscription. You can change your Subscribe & Save date here. You can cancel your subscription here. The price is NOT locked in.
I wasn't familiar with subscribe and save although I have seen it before. Thanks OP for highlighting price is not locked in. I looked at the guide for subscribe and save and thought this useful for others to know too…
"While you will always receive a Subscribe & Save discount, individual product prices can go up or down over time. If the price of your subscribed product changes, the new price will be displayed in your order review email and will be applied only on future shipments. You can review your subscription price and edit or cancel your subscription at any time.“
So long as I keep an eye out for the emails and price changes I am happy to keep this going but know I can cancel at any time.