If your after new Goldcity Detecting have a good package deal at the moment. $6799 with free etrax 20 GPS, control box cover, carry bag, 8" x 6" NF coil, B&Z booster + dual speakers & free shipping Australia wide. If you contact some of the site sponsors they may do a similar deal?
Coiltek have used detectors with warranty. You need to contact them re: current stock etc.