Let's see...
Most expensive? Not telling. Not that it was a lot of money, but because it shows just how cheap I am.
Least expensive? FIE Mod. E15 in .22 Magnum. I know that it had a cylinder at one point for .22lr, but it wasn't offered. Back when I worked at Outdoor America, one of our regulars came in with it, and wanted the gunsmith to have it repaired by the weekend (it was Tuesday). Of course, the 'smith couldn't do it as the parts would've taken about 10 days to get here from Numrich.
The guy approached me, explained what was going on, and asked if we had any new single-action .22 revolvers and what I would recommend. Seems he was taking a few new shooters to the range and needed a good starter gun. As we were waiting for the 4473 to get back on his Heritage Rough Rider 7" (just like the one I have), we were lightly chatting about random stuff when he asks me if I'd like to have the E15.
My reaction?
"So what exactly's wrong with it?"
"Well, the pin that the cylinder rotates around is missing. Also, the bit that holds pin in there is missing too. Lost them a while back when I was cleaning after a range trip, and haven't found 'em... but if you want it, it's yours." At this time, the 4473 comes back as Accepted, and I sign off on it. "'sides, I apparently just got a new one, so why would I need two?"
I didn't have the heart to tell him that it'd be my second one as well.
Anyhow, long story short, I ordered the parts from Numrich, installed them, and it shoots just fine for a gun I basically paid $30 for.
Loud, accurate, and fun.