No, never have seen one in a binder. I would say I hunt them out. Lots of people I know have "that box in the back of the car" with last season's draft leftovers. I also make appointments with friends to stop by their place and help them shrink their rotation stock / riffle through their c/u boxes. I have a thing for powerful commons and uncommons, they are so far under many peoples' radar that you can glean a lot of value by just being willing to look through somebody's junk box.

Tagging that bird with Tezzeret's 5/5 ability is definitely awesome. I'll check out the thread!

Here's the thread in the N&D forum on the Source, it has some pretty good discussion there:
http://www.mtgthesource.com/forums/showthread.php…

Do you find that people often have them in binders or do you have to hunt them down?

I meant to address this in the article, but I neglected to… It was at about $4-5 when it was first debuted – it was a hyped card. So the market on it started at $5. I didn't do an email blast or an article writeup specifically because it only really works well in Vintage. I posted in the forum as a heads-up but I was not confident enough that it should warrant more exposure. I was, honestly, surprised that it went up to $10 on the back of Vintage. I take my card endorsements very seriously and I don't want a person to stock up on $5 unmovable monsters because I breathlessly shouted to get them.

Agree with you that Bonfire won't hit 45$ at auction. $35 seems like a solid ceiling that will be tough to break through without the card warping the format first.

I didn't discuss it because it's still largely untested – here's the article that my teammate wrote about it:
http://www.starcitygames.com/magic/legacy/24636-L…

In the week since that went up, a LOT of Agents have been selling on ebay. Strix is pretty-well proven, but the Agent needs a little more proving to do. I like the card and the deck a lot and I'm looking forward to using it in Legacy – it's one to keep a serious eye on.