The classic, skinny bail 3-pin binding is dead. Alpina is the only company making boots for these bindings. I work for a rental shop in Gardiner, MT (near Yellowstone) and we rent these things. The quality on the boots has gone in the toilet in the past two years and we've had more than 20 pairs come back this season with the sole separating from the uppers after less than three rentals.
For next season, we are going to switch to BACKCOUNTRY 75mm, which is still a going concern since this is the size/shape of duckbill that most tele gear is still based on. There are still quite a few backcountry 3-pin boots made. Those Whitewoods are backcountry. Alpina makes two models, Fischer and Rossignol each make a couple, used leather tele boots would fit, etc. These bindings are much heavier duty, with a solid piece of metal over the top of the boot rather than a thin wire bail that likes to break. Rottefella makes what they call a Super Tele binding and Voile makes the Mountaineer. I suggest the Mountaineer because it's identical to Voile's cable binding, without the cables, so if you found later you wanted to do some gentke tele turns or even reasonably secure parallel turns on groomed tracks, you'd just need to buy the cables.
For boots, the Rossi BC-X6 75mm would be my choice in a new boot, or that Whitewoods if you just want to see if you like it.
Huh, I registered here to ask questions about alpine gear and my first post is answering a question instead. Weird...
If your skis are skinny, track-type skis with no real sidecut, particularly if they're less than about 65mm across at the tips, you will be much better off switching to a NNN binding system because of the boot problem mentioned above. My choice in NNN being the BC Manual by Rottefella with an NNN backcountry boot. This is a thin enough binding to fit on skinny skis, but will be burlier than a standard track-type NNN binding that might get snow-clogged or otherwise fail if you take it into softer snow. No really solid tele turns on this type of binding, though.