The fee for returning drivers is $500, something to keep in mind. I forgot about the reduction for returning drivers the last time I attended. It all worked out in the end because I ended up finding one for a good deal, but I spent some time concerned that I wouldn't get a slot in the day that I wanted because I had problems finding one for sale.
A fair going rate is $250~$300. There are other SRT forums to shop, think Challenger, 300, etc. I think those have a higher sales volume than the Jeep SRT. If you do your research you can find it even at a lower price.