Here is reference link to mineral deficiencies. I always plant my toms waaay to tightly to each other and always have BER. Will attempt to watch  this year and monitor better.

http://www.haifa-group.com/knowledge_center/crop_guides/tomato/plant_nutrition/nutrient_deficiency_symptoms/

 

I went today to Home Depot and found that they started to carry Superthrive, not the cheapest but bought myself bottle.

 Also Menards is the one store that does try to carry organic fertilizers

I particularly like these

http://www.organi-gro.com/plantamp.html 

 and these

http://garden-safe.infinitylawnandgarden.com/products/plant-food/tomato-vegetable-organic-plant-food