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You get what you pay for...
Many have good luck with the Styrofoam incubators if you are going for cheap, but they can be very finicky to use. Seems that most here say those styro bators are chick killers and would have never bought one had they known how hard and finicky they are, and that they should have just spent that money on a better one.
For better luck, I'd be looking to spend 200+ on a decent incubator if you don't want to make one yourself. Regardless of which one you do get, you want to run less important local eggs the first few times till you learn what works and what does not work with your incubator. There is no perfect way to run a bator, as every season, room, and house will have different conditions that work for them and not for others. For example... I never check humidity and don't have a problem with hatches. I just watch air cell size.