I've never seen any I thought were small enough for bluegill. It might be easiest to bend some regular hooks into that shape.
Why are you looking for circle hooks for gills, anyway?
I did a quick search and found these threads:
http://crappie.com/crappie/showthrea...t=circle+hooks
http://crappie.com/crappie/showthrea...t=circle+hooks
http://crappie.com/crappie/showthrea...t=circle+hooks