You can buy any price you'd like, here's a link to choices:
https://www.google.com/search?q=chev...hrome&ie=UTF-8
I'm not sure if you're aware that the 2 lowest bolts from a chevy pattern are in the same position as BOP pattern, and screw into the block, the upper 4 need to screw into the adapter plate. There's no real magic to the adapter plate connection, or convertor to flex plate.