A friend recently purchased a diffuser. She hemmed and hawed for days before buying it online from Amazon. She even turned down a Groupon offer (which was apparently very tempting!) before finalizing her decision.   So let's say you Google "essential oil diffuser".  Your search comes up with "about 525,000 results.  Of course the process is overwhelming.  Add to it, many people are novices and aren't sure the level of investment they want to make, let alone what style and size to pick.  Let me help you out by narrowing your search. Target  offers a small, but very affordable option.  This one retails for $19.99.  Travel friendly, it operates on batteries or with the included USB cord.  If you want something that will last 1-2 hours, then this is the product for you.  However, if you are looking for something with more oomph, I would recommend the next model. This diffuser by Now ranges in price from $35-$45, depending on the vendor.  It offers a soothi