Do you have anywhere to get an antibiotic? This is what you need to treat your chicks. https://www.jedds.com/shop/tylan-soluble-100-g/
Yes, it looks like it is back in stock after being out of staock for many weeks.Agreed!
I do suggest the OP order as soon as possible, that gets sold out quickly.
Sneezing with drainage and bubbles in the eyes is usually a good indication of Mycoplasma.
The Tylan will treat the symptoms, all though the birds will always be carriers.
Getting some testing to find out what you are dealing with is the best way to go, but that may not be an option.