I just checked eBay, and a pretty well equipped Essence just failed to meet reserve with a bid of $1555. This bass had a superb flamed walnut top and side LEDs. I have seen some basic models from the early 90s go closer to $1000, and a custom with upgraded electronics and side LEDs among the options go around $2000. The high-end one was only an Essence in name because that was the most economical model to build that particular custom from.
Oh, and they seem to go for siginificantly more in Europe.