Freshfield Vegan All-In-One Plant-Based Protein Powder, 20 Servings, $10.99 after coupon (or as low as $6.04 w/ S&S)

Chocolate (799 g) and vanilla (716 g) flavours are on sale for $32.99, clip the $22 coupon to bring it down to $10.99. Subscribe & Save options are available to make it even cheaper (e.g. $6.04 before tax w/ 15% S&S). Seems that the coupon can be used only once.

Fair warning, the reviews are a bit dicey concerning taste and mixability mostly, though I personally think the price is right to give it a shot, particularly with 15% S&S. Sold by Freshfield (4.8/5 from 759 lifetime ratings) and Fulfilled by Amazon.