I don't thing you will get much for your $50 in a spotting scope.
When I, and my eyes, were MUCH younger I used some inexpensive SS and got by with them. I now have a Nikon which is about a $400 scope and I can 'get by' with it. I have sold several Redfield SS recently and they were VERY well liked by my customers but they are in the $200-$250 price range.
To answer your question, Tasco as some in the $100 range. Other than looking for a used one I can't give you any other suggestions.
Welcome to the forum!