The Vapor Hut offers a huge collection of slightly-overpriced liquids that are well-balanced, consistent, and enjoyable. They focus primarily on the middle of the market, producing a couple dozen particularly distinctive flavors and a sea of standard fruits, sweets, tobaccos, and the like. Their web site groups some flavors into small thematic ranges, like the Space Wars range which introduces some almost-familiar names from George Lucas's original trilogy. but most flavors are available through an unwieldy, paginated list of over 100 items. Unfortunately, poor web design and overly-excited flavor descriptions seemingly written by angsty teenagers make shopping more of a pain than it should be.
The larger bottles they use (50mL and 100mL) tend to leak when they get low, with the 100mL bottles losing quite a lot of liquid before they're empty. However, they offer a bulk discount on 100mL bottles (but not any other sizes), so that offsets the inconvenience somewhat.
I no longer shop at The Vapor Hut, but they're worth a look if you're trying to find something specific: they may well have the perfect espresso/banana blend you never knew you needed!