There is a trainer here in Indiana that makes and sells them online Pintura Springs ~ AQHA, ApHC, APHA and TWHBEA Horses for sale.
both the regular and training halters - in all sizes!
It's what the (previous) owners of my mare use. She calls 'em "Cowboy halters". I'd like one but a thin one - not one that is bulky like some I've seen.
And Christine - The ones I've seen, you can clip the lead rope to the halter, but if that's an issue, you could ask the person making the halter (if you buy it with specifications) to add a loop where the knots are so you can still crosstie. Just a suggestion!