8 1/4 rear end

hi guys i was just wondering if anyone has (or knows where) an 8 1/4 rear end that is for sale. i would be putting it in my 69 dart. i would prefer it to be an A body rear and i would prefer it to be a sure grip, but any 8 1/4 for the right price will do. i would like it to be as close to a drop in as possible.
thanks -casey