Purchasing Celestron OMNI 9mm PLOSSL Eyepiece Optical 4-Element 1.25inch Spotting Scopes Telescope Eyepiece Lens online, there are many advantages, but also a few disadvantages. Here are some tips to help you take advantage of buying online the next time you need an items item. One of the main reasons that people acquire goods online is to be able to compare prices more easily, while not having to visit many stores which may be miles apart. Online, you are able to compare prices on something all in the same browser. Something that can make your price comparison purchasing easier is to use price comparison search engines like google. There are sites like PriceGrabber and Nextag that screen a product and show you the prices and even the shipping costs to your location for as many as dozens or hundreds of different stores. These sites can be a real time and money saver!