Reef Crystal's is $35 for 200 gal box on amazon right now.
Instant Ocean Reef Crystals Reef Salt 56 Pounds, Formulated Specifically For Reef ... https://www.amazon.com/dp/B0002DJU0G/ref=cm_sw_r_sms_c_api_i_TTJJEbANSTWW2
Instant Ocean Reef Crystals Reef Salt 56 Pounds, Formulated Specifically For Reef ... https://www.amazon.com/dp/B0002DJU0G/ref=cm_sw_r_sms_c_api_i_TTJJEbANSTWW2