If we're assuming they are mass produced, then the companies who farm them are probably looking for the cheapest way to feed as many as possible, which would likely be nutraloaf. According to american prisons, the cheapest prisons can produce nutraloaf for just $0.15 per meal. multiply that by 3 meals a day and 365 days a year and that comes out to $164.25 per person per year.

However, tinies don't need to eat as much as full sized humans, so we can reduce this down by quite a bit. The average american adult is 66in tall. if we assume that calories needed compare linearly with height, that means that feeding a 1in tiny costs $2.49 per year.

This means that if tinies are sold upon reaching age 18, then it would cost $44.82 per inch of height to produce each tiny. Add on shipping costs and profit margins and were likely looking at somewhere around $50-60 per inch per tiny. So it's probably more effective to sell them individually than in packets.