At first I thought you meant AGN's Classifieds but you're talking about Brad Troyer's site . . . it's probably just a temporary glitch and it'll be back up shortly.
I've gotten several good deals off Brad's site through the years...if you have any common sense at all you can spot those low life scammers a mile away! And if your not sure ask for a phone number to have a conversation....that will scare off a scammer in a heartbeat!!!
Ive dealt with Brad himself a few times too. Last time this happened his web server did some upgrades without contacting him and screwed it up for a couple days! He'll figure it out!