I can access a product via 3 URLs:
/detailfast.aspx?ID=23407
/23407/products/kryptonite-kryptolok-standard-u-lock-with-4-foot-kryptoflex-cable.aspx
/accessories/locks/kryptonite-kryptolok-standard-u-lock-with-4-foot-kryptoflex-cable__23407
There is a canonical tag in place here that points to the last URL above as the canonical, but a 301 redirect to properly canonise these pages would be better.