You gotta dig a little. I found this one in about 5 sec. It will give you sticker shock though! Good luck in your hunt, Dave.
http://www.mscdirect.com/browse/tn/...40728+4288213885&searchterm=taper+shank+drill
Consider giving Tried and True in Fridley MN a call.
https://www.facebook.com/pages/Tried-and-True-Tools/154405481261996
(763) 574-0407
They don't have a website.
Honest guys. Not cheap, but usually on the low end of competitive for used machines and tooling.
My experience is that they will openly disclose any issues with what you are purchasing.
Daryl
MN
You have any particulars on length? I have piles of mt shank drills. None new though. But I can look through them a bit a see if there are any that would be of use to you. I have probably 1,000 lbs of them I culled out of 6k.