If you own a Celestron SkyProdigy 6″ SCT telescope, you can fit the Celestron #93781 9×50 erect image angled finderscope to the OTA (optical tube assembly)
The only additional items you need to purchase are longer screws to make it fit properly. The screw size is M4 x 12mm
The Celestron 9×50 illuminated finderscope is optically superb. Good enough to be a fantastic wide field scope on its own
Buy the Celestron 9×50 erect image finderscope from Northern Optics