Despite the single positive review there, I find it hard to imagine that any scope in that price range would be usable for birding. Celestron was a fairly respectable name at one time, but I don't know what's happened to it lately. I have a 20 year old Celestron scope that I've been pretty happy with. It was discontinued when I bought it. It's definitely in the bottom end of the scope quality spectrum, but it was good value.
I also have a pair of Celestron binoculars that are about 10 years old. They're okay, but not nearly as good as a pair of Nikons I bought a few years later for about the same price.
You don't have to spend thousands on a scope, but you'll probably need to spend a few hundred if you buy new. You may also be able to find a used Bushnell Spacemaster. They were once the most common scope around. There are likely quite a few around sitting in the closets of people who have upgraded to higher quality optics. I'm pretty sure they're discontinued now, but they used to sell for around $200 - $250.
BB