Tractor Supply CompanyWhere can I buy chick feed today? I could order it from amazon, but I want it today.
Rural King
Any other place that sells livestock feed
Walmart (I don't know if it's all Walmarts or just some)
Some pet stores
If you don't see chick starter, start reading labels. You are looking for protein of at least 18% and calcium no higher than about 1% (1 point something is fine). Other than that, it should be labeled as a "complete feed" (feeding directions say to provide it free choice, plus water. They may say to provide grit and/or free-choice calcium, or they may not mention those.)
Appropriate feeds might be labeled chick starter, or chick grower, or all-flock feed, or flock-raiser feed. Meat bird feed or broiler feed should also work. Or a duck starter, or a turkey/gamebird starter (that one has more protein than they really need, but not a dangerously high level. Up to about 30% protein is safe enough, but there's no point in paying extra money for protein higher than 20% if you have a choice of protein levels and cost.)
If you cannot get something suitable today, scrambled eggs + bread is not too bad for a few days. At least that provides good protein plus a source of calories for energy. Letting them eat grass, and maybe whatever scraps of vegetables and fruits and meat/fish ou have handy, can help a bit with vitamins & minerals, but a balanced chick starter is definitely faster & easier as a long-term solution.