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Amazon [amazon.com]has Mastering Bread: The Art and Practice of Handmade Sourdough, Yeast Bread, and Pastry on sale for $ 16.79. Shipping is free with Prime or orders $ 25 or more.
Saf Instant Yeast, 1 Pound Pouch (B0001CXUHW)
for 10.00, currently not shipping, but can be ordered.
Not the best price, but it’s available to order, fulfilled by Amazon and quite less than the other price gauging variants.