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Originally Posted by AlittleSalt
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If you get 5lb, you also need 5 lb of calcium nitrate and 2.5 of magnesium sulfate (as a general fertilizer for mature tomatoes). So you need to consider also those for price. There are bundles on ebay and so, better to take those that are not premixed. If moisture got into a premix it could partly react to make unusable stuff. (you can't make concentrated mixture either because of that).
Here in Europe there is kristalon from Yara, as premix ready to use (for example 'kristalon red calcium') which is a good formula, and ok priced (11 lb for 20) which is just good for amateurs container gardeners (care must still be had with moisture), not sure about USA. Haifa might also have something.