I haven't bought an incubator in years (mine go on the shelf in the reptile room). But back when we used to buy them, the cheapest Hovabator was actually the best. That is because it didn't have all of the fancy "extras" that we don't need, such as fans and egg turners.
You probably already found this out, but when you do get it, be sure to set it up and get the proper temp at least a week or more before you expect the first eggs. Once you put eggs into it, tape down the control and don't adjust it further, because it will usually get too hot and kill the eggs.