There ARE a lot of used machines there, you gotta know where to look. Check all the used listings, remember some older folks may not use CL, etc. What you're looking for, what I've been looking for, is some family where the man died and the family have to clean out grandpa's shop. They don't know what it's worth and will sell it for pennies to get rid of it. Trust me, BTDT.
Check in Huntsville AL too, there are a lot of machinists and engineers there and I've seen most sold there. I have a feeling Cincinnati may be a good place to look too but I'm only guessing about it. I'm assuming these places aren't too far away.
If there's a place that warehouses used gear, check that out.
If you want much new CNC shit, then check out govliquidation and the others (it used to just be govliquidation but now they're a bunch of auction firms and that's just one of 'em --I'm still confused but at least I know how to buy shit!). I see ALL SORTS of machines come up for sale on there. Recently they had a Bridgeport radial mill, big ten foot tall fucker, sold for a little over the cost to move it. With liquidations, they can be anywhere, and so inspecting them can be a hassle. Especially if you can't get on post without jumping through hoops (they've made it MUCH more difficult to get on military bases in last several years).
Sirhrmechanic is a member on here, he's in a colony state, but he's also a master machinist. Lots of guys on here are. If you don't get many hits in this thread, try moving it to "bear pit". Good luck. And FWIW, I'd actually LOVE an old Bridgeport! They make upgrade kits for NC and even CNC IIRC. Not sure how much those go for.