Doctors Foster and Smith.com has 200-Gallon Instant Ocean & Reef Crystals Mix Box for Saltwater Aquarium + $5 Gift Certificate w/ Purchase on sale for $46.99 - Extra 15% off w/ promo code BONUS15 (apply in cart) = $39.94. Shipping is free. Thanks thedealguy79
Note, if you setup "Auto Delivery" you'll also be eligible to receive a $10 gift certificate w/ your order. Make sure you select the correct option.