Sarah if your 4H decides to have a chick auction ask on here for donations. I have seen members donate hatching eggs and even chicks to other 4H groups. If you ask ahead of time you could even hatch some of the eggs yourself before the auction.
I for one would donate.
If you have an auction place nearby you could do a chicken auction, sell snacks and drinks and maybe even have a silent auction set up. That could range from items donated from businesses and local merchants to services offered.
Having a huge poultry community helps and since it's 4H people...