I'm very pleased with this vendor. They are UK-based, but have a warehouse in the US that allows them to quickly ship within the country. Shipping usually takes 2-3 days, and I've never had a single problem with them. Their juice prices are some of the best around and average from 5.99 to 9.99 for 30ml depending on the flavor.
The only downsides I've found with Liberty Flights is that their American website could really use an update, and their US inventory isn't as large as their UK inventory.