Well said Stimigex.
Lizardjasper I would first try to find out what subspecies they are selling before purchasing as there is considerable pricing difference between them. I'm guessing by "desert" they probably mean the more expensive Western Australian goldfields rugosa rugosa as mentioned above, which are generally larger, chunkier and much more colourful than their coastal cousins. WA Goldfields have a mix of black, orange/red and white markings, and shouldn't have any brown on them as adults. There can still be considerable variation with genuine goldfields with some being almost solid black, all the way through to almost solid orange animals, with most having a mixture of colours.
Try to buy captive bred where possible, and be wary of those with washed out colours, poor condition and old wild caught animals.
Here's a crappy iPhone pic of most of my group of goldfields.