Previously finding the female 86-pin slot suitable for the Amiga 500 was hard to do, almost impossible. Not anymore, ESI has at the moment 135 86-pin female Zorro1 slots in stock!
You are not a true Amigan before you have made your own Zorro 2 slot for your Amiga 500 
http://www.electronicsurplus.com/commerce/catalog/product.jsp?product_id=68556
Instructions for hacking a Zorro2 slot out of the A500 is available at Aminet.