Actually, they're not that hard to find with a basic search.
Here's the rub: It's a competitive realm, isn't it? I mean, if you're "in the game" chances are you're not handing out information that you feel gives you a competitive advantage, right? That, in part, is likely some part of the explanation for why no one is chiming in with answers.
The second part is we're pretty much opposed to tool drops in this domain forum. Why? Well, if we didn't restrict tool drops chances are pretty good that the makers of those tools would send their agents to repeatedly set up pseudo Q&As about "Is there a tool . . ." - which would then open the door to endless posts on the same subject(s). I've seen plenty of forums filled with such self-promotional fluff.
Maybe we can loosen the rules for a change? Just once or once in a great while? (I'm still working on these issues. ;) )
Alrighty folks, let's do this one time and then, maybe, we can tuck away this post in the Domain Forum Library for future reference should others raise the same question - again and again. ;-P
The door is now open (briefly) for anyone who cares to address the question: Where is a good place to find expired domains with link pop, etc.?
Fire away. Invite your evil spamming friends to post their tools. Reveal your bestest secretest secrets if you dare. ;)
For a quick peek I like to scan the free service at SnapCheck.com. They've done me some good. In fact, I recently ponied up a few bucks when they asked for donations.
There's others aplenty. Anyone care to share?