For my little ones (buttons) I use a wild bird feeder like this:
http://www.acehardware.com/product/index.jsp?productId=1289104&CAWELAID=109350365
for my coturnix adults I use J feeders like this:
http://bassequipment.com/Feeders/Standard+Bass+Feeder/default.aspx
I also use a large J feeder in...