Try R and B lures (Jacks Snacks and Tackle) in Oregon.

http://www.randblures.com/r___b_lure_co__casting_spinner_components.html

They have a pic of their bell bodies in this link, but don't seem to have a separate order page for them. Might be worth a phone call or email.

I've also seen bell bodies at Outdoor Emporium in Seattle.