That's a beautiful badge. Google will be your friend. As a local, how many members have you had initiated? I'd guess you'd be more likely to find them in local antique shops than online.
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ΣΚ one heart one way
::: waiting for someone to post in Irishpipes 2013-2014 chapter listing thread that quota was .25 ::: - ASTalumna06
I would get together a list of all your alum sisters and than ask your college's alumni office for contact information on these sisters and see if any of them are willing to donate them or maybe some sisters have passed away and their children inherited the badges? That would be my steps...