P&B - hijack away! I love the pellets. My birds eat Lafeber's Finch pellets. They are available at most pet stores (like Petco, PetSmart, etc) in 1-lb buckets for like $6. I bought them that way at first, but now I get the 5 lb-er from Amazon for about $20, including shipping. My finches converted easily. And honestly, the more finches you have, the easier it is to convert them, because of your flock of 13, you will have at least one shamelessly brave one who will try them out, and then the rest will eat.
Here was my conversion process - pellets and seed offered together for a few days (nobody touched the pellets, of course, but at least they got used to having them in the cage). Then I'd start taking the seed out in the morning and evening just for an hour or so. I did that for a few days, and watched them like a hawk until I saw some of them eating the pellets. After that, when I was certain the birds were at least recognizing the pellets as food, I went several days where I left the pellets in there all the time, and only put seed in there for a couple of hours a day, to make sure the conversion was slow. Then I stopped putting seed in altogether. Now, seed is like a once-a-week treat, or any time I have to do something stressful, like clip nails, or transfer cages (

) or something. Then they get their beloved seed as a treat.
Advantages of pellets: Much higher protein content than egg food (I don't feed egg food as a result - pellets are better), less mess (there are still crumbs and dust, and there is some waste from tossing food about, but not nearly as bad as seed), and generally better nutrition overall. And with all your birds, just one eating it will show the rest that it's okay, and you'll have pellet-eaters in no time, I promise.
(PS - when I had parakeets, they would never eat pellets, either. I finally gave up on that, and fed Lafeber's Nutri-Berries for parakeets exclusively, though I had to crush up the berries a bit for the keets.)