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Amazon has 1-Qt Botanicare Cal-Mag Plus (Calcium, Magnesium, & Iron Plant Supplement) for $ 14.46. Shipping is free with Prime or on orders of $ 25+.

Highly fortified calcium, magnesium, and iron plant supplement formulated to correct common deficiencies
Supplement your existing nutrient program with Cal-Mag Plus
To Use: Mix well and use with every watering, as needed, for enhanced growth apply as a foliar spray
For use in containers, coco, hydrogardens, and when growing in soil
Contains formulation of 2-0-0 NPK