they dont go for that much in stores, there like 100 cheaper in stores than on the site. im really praying that you didnt mean that you saw the 5900 going for 500 because that alarm is about 3 years old so that would NOT be on any site for 500. the 5901 lc3 is on VIPERS site for 599. not bashing just letting you know. i had a bnib viper 5900 that i sat on for about a month and i was selling it for 250,