I have long time customers that I sell them to. I also pick up a new customer about every 3 months. I get new customers by word of mouth now. My usual customers have standing orders from as few as 1 dozen to as many as 10 dozen each week. I started selling eggs years ago by putting an ad on Craigslist. From there, it took off. I never had to advertise again. My long time customers refer people to me all the time. I also sell eggs to local restaurants who support local farmers/local produce, etc.
My customers send me a weekly email or text or call me to place their order. I get their order ready and drop it off to them on my way to work or doing my weekend chores. I do not go out of my way (gas is too high for that) to make special deliveries. They will meet me a designated areas on my route. It works perfect. I have had to order 40 more layers for this upcoming spring/summer because I could not keep up with demand.