You can find them here in the $2000 and up range, depending on mileage and powertrain. Verts and manual t56 are pretty hard to come by, in fact not much luck finding ls1's with T56 around here. I am getting contacted by several people on my ads as far as just selling the tranny even though I say on the ad tranny and engine are not for sale
I just spoke with a buddy that did his 69 recently (Mac) and rather than modifying harness etc, he was able to use and modify the stock column, so major savings on the swap, plus tilt, cruise control, will have ABS, etc etc. He modified the dash to fit his Firebird and looks really good!