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Hi Billi,
I am going to come at this from a different angle to where everyone else pointed you (Brian did at least suggest not to waste your money on a poor quality barlow). The scope you have is a very good entry level scope and should last at least 1 year and possibly 2 or 3 years. These have a parabolic primary mirror and assuming fault free optics should be capable of running to a bit over 200X on the moon and planets, which you would achieve with a 3mm eyepiece. Seeing conditions on a large number of nights might prevent you going this high.
What I have learned over many years is that people often upsize, downsize or change telescopes but they will generally keep good quality eyepieces for a very long time and use the same eyepieces, in different scopes, as they change scopes. Consequently, I think you should head away from the budget end of the market as those eyepieces and barlows will only ever be that. At some time in the not too distant future, as your observing skills improve, you will realise that the eyepieces that came with the scope are pretty ordinary and you will look to upgrade them. Buying more cheap eyepieces and accessories IMO is only burning money as you will at some time in the future give them to someone because no one will buy them when you want to upgrade. I think you should start to assemble some better quality eyepieces now, which you will keep for many years. If you don''t keep them for years you can at least sell them and get your money back on them. Whilst not everyone can afford to go and buy a new set of Pentax XW's, Ethoses or Deloses, there are some excellent high quality eyepieces which can be bought very reasonably on the second hand market. I think this is where you should start looking. Be patient, they may not come up this week or next week, but they do come up and you can start to build a good set of high quality eyepieces over a period of time. Most importantly you will be able to sell these for about what you paid for them.
I think you need to get something in the 5mm to 8mm range as your next eyepiece to give you a bit more power on Solar System targets. I would look for something like a 2nd hand 5mm, 6mm or 8mm Televue Radian, or a 5mm or 8mm Vixen LVW, or a Pentax XF 8.5mm. You can often buy these for somewhere between $130 and $200. If you upgrade your scope in the future; and as your observing skills improve, you will realise that these eyepieces at least allow the scope to deliver its best performance and it is not handicapped by mediocre quality eyepieces.
Whilst $150 to $200 may sound like too much money at the moment, you would always be able to get most of your money back in the future if you ever want to sell them. if you keep buying $50 eyepieces you will have an eyepiece collection worth $0 because they are basically not saleable on the second hand market.
Cheers,
John B
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