The little black one about 3" long from Primos you can use as an inhale, Woods Wise out of Tn. also makes one that you can inhale, if Im not mistaken the Buck Grunter Plus that has a hands free mouth piece can be inhaled.
Man I have a inhale only hands free one that was hand made by someone in kansasthat has an awesome mature sound to it but the tag fell off it a long time ago so I cant help you with that one.I will try and post a picture of it on here tomorrow maybe someone will know more about it.
Wish I could help you more but I get mine for free and I keep it in my jacket like you said!