Bodybuilding.com offers the Dymatize ISO-100 1.6-lb. Whey Isolate Powder Tub in 10 flavors (Birthday Cake pictured) for $29.99. In-cart, that drops to $25.49. With $3.99 for shipping, that's the lowest total price we could find by $7, outside of the mention below. Deal ends February 26. A close price: a variety of third-party sellers via Amazon offer prices starting from $29.99 with free shipping (or less, via Subscribe & Save).