Here a decent deal if you were looking for a Glock 21SF.
https://www.recoilgunworks.com/pd-trade-glock-21sf-45-acp-night-sights-13rd/?sku=PTI-G21-SF&
https://www.recoilgunworks.com/pd-trade-glock-21sf-45-acp-night-sights-13rd/?sku=PTI-G21-SF&