Is there a non-zoomable scope in 20x to 32x power still being made?

I don't use the zoom function on a scope EVER. Set them to 20x and leave 'um. 

I need a light weight ( 16 - 18 oz. hopefully.) fixed power 20x-32x, non illuminated scope for a 50 - 250 yard slug gun. 

Hope to spend $500 max. I can't find much in all the thousands of variable power scopes advertised online.

Found one scope with a rear AO it's light weight but a 36x power. Not sure I care if it has AO for this gun actually. 

Any suggestions would be greatly appreciated.