i feed it to luc and teagan when we're backpacking, and sometimes at home as well. i've never fed it in the same meal as kibble, but i feed the dogs grain-free kibble w/raw given at times, and they've gotten THK the same day as kibble and been fine.
....i just got a box of embark for my puppy who is coming home in early/mid june - i plan to feed him embark and orijen puppy kibble.
i've never ordered it online - as far as i know, you can order it from the THK website, and Leerburg also carries it - i got one of the local dog stores here (okay, it's a 'boutique' (la di da) but it carries good food!) to special order the box for me since they normally just carry the bags. maybe also check w/pet supply places in your area to see what price they could order it for you at.
edit: and results-wise - it's a good food. i can switch the dogs over to it for a trip no problem, though i always add extra water as was suggested to me by somebody on the leerburg forum, and no bowel problems, the dogs love it.