Walmart has the 1 Gal Endless Summer Outdoor Bloomstruck Hydrangea Flowering Bush for $15.62. Shipping is free with $35+
This is 50% off regular price and $8.37 cheaper than the next available legitimate retailer. Other retailers have 2 gals starting at $40. With the Walmart version you could pick up 3 for $46.86 and get free shipping.
Keep in mind soil variations may affect the final color of the blooms.