Just a few months ago, there was a worldwide shortage on these popular LED lights. Now competition must be fierce or the market was all of a sudden super saturated. Recent price drops on both 500 & 1000 LED panels take it down about another $40 bucks. Not a huge or crazy saving, but a discount none-the-less I guess. These are practically the same lights used in this video http://cheesycam.com/cheap-500-led-1000-led-and-z96-lights-in-use/.
These are a small step above the another one you might find, as these are both dimmable through a series of switches, or by a Dimmer Knob. These are also powered with the XLR type connection which means it can be modified to use the V mount batteries for portable use.