Barlows can be had in a variety of magnifications.... 2x, 3x, 5x. It all depends on how much magnification you are chasing. Only when conditions are near perfect, which isn't often, you can approach 300x. I have only been past 300x once.
If you wish to avoid spending a lot of money at the moment then stick with the basic brands. It is probably a false economy to couple high end barlows with starter eyepieces.
If it is clear tonight it might be worth tracking down the Orion Nebula as it sets fairly early.
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