Are you looking for field boots or dress boots??
As far as for dress boots your best bet is to find a dealer and get measured, and this will usually end up being for one of the more mainstream brands like Petrie or Konig. I have Rectilignes which do have a short option and because they are not full custom were not as ridiculous for price.
I'm looking for dress boots. I haven't heard of Petrie or Konig... I couldn't find the webpage for Konig, but it doesn't seem like Petrie sells in the U.S.
I've tried short boots, but they tend to be too skinny, or they fit in the calf but they're too big in the ankle, etc, etc.
When it comes to custom boots, Dehner is the first and last word.
They seem promising. Really pricey, but there're a couple dealers within an hour of where I live. Do the dealers tend to have samples of the leather and photos of the different options on hand?
OP sorry to ask a question in your thread, I thought that maybe the answer might be useful to you as well.
I already knew the answer was something outrageously high, but probably less than my horse... when he's wearing his saddle
I have Der Dau customs. I ordered them through Dover. It was a nightmare. I had to send them back 3 times. Then I finally went and found the Der Dau tent at Rolex last year and talked to the guy. He remeasured me himself and personally took care of it. Then I got a phone call saying there was a fire at their office and my boots burned in it and they were going to make me a brand new pair. Now, 4 years after originally ordering them, I have my boots. They are super nice, but are taking forever to break in. I have tried every trick I know. It was an ordeal, but I think having a pair of boots that fit like a glove is worth it. If I had to do it over again I would have probably gone with Parlanti boots though.
Yikes. That's the kind of experience I'm afraid of having with the do-it-yourself measuring kits!