Demand for local, farm-fresh eggs is stronger than ever and a number of small farmers are stepping in to fill the niche market, despite the challenges of a break-even enterprise. Meanwhile, at market, consumers may be baffled by a dizzying array of choices. Eggs vary widely in price and design from conventional eggs that cost as little as $1.69 a dozen to the more specialty varieties, such as “free-range,” “cage-free,” vegetarian fed, certified organic and local that can cost between $4.99 and $8 a dozen. Though it’s difficult to put a firm figure on exactly how many people are selling …