Michelle, the company that Mike has in his response is the company that bought all the dies from Ideal in RI, Ideal had a minimum of 10,000 pcs/style/color, the company they sold it too, International Metal, raised the minimum to 25,000 pcs/style/color...that is just for stock items.
Your best bet is to incorporate something that's out there already into your design; hand make each clip; make a master of the clip you want out of a material that can withstand the heart of vulcanization, and then send it off to a casting house; or if simple enough, cast it your self in with either sand or delft clay casting.