I didn't read the other posts cause I have to leave for work ASAP.. but try a Halti, I used it to train the psycho dogs at the shelter & my ex-friends 200 pound rotti... I even used it to train Max... it comes in many colours & costs about $10-$15 canadian.. make sures it comes in a box & its a smooth material.. the ones in bags r a rough material & will cut into a dogs muzzle... I find choakes r useless & take way way too long to train the dog..
I know Pet Value has Halti & the choaker u want too