Congratulations on your first egg!! check the calcium and fiber on your feed as it may be well balanced.  I have used oyster shell free choice with chickens or you can choose to offer crushed egg shells as well.  I give my birds standard mealworms that are around 7$ for similar size bag and mix it with premium scratch grains.  they all love it!!! but remember that treats should be only 10% or less of overall diet.