TSC does sell Corid...but in the cattle section and only in gallon jugs. I have goats, a calf, chickens, geese, peafowl and dogs...I paid something like $80.00 over a year ago and have used it in a few cases...but have a lot left. Maybe if you call a vet they can supply you with a smaller amount?I keep mine the the fridge hoping it'll prolong the shelf life! It does work well and you can see a difference in just a matter of 3 days IF you catch it early. The medicated feed should help you a bunch with the other chicks but this particular baby might need a little "extra" to get him past this bout. Good luck - keep us posted.