OK - here's what I found out (the following is just my personal opinion, not intended to criticize anyone):
Cage Consulting - $500, two hours of prep, homework, 1-2 sessions additional prep (maybe?). In my opinion, Cage might have been good in the day with Cheryl Cage having an "in" at United, but seemed like generic prep. Multiple mis-spellings even on the website was a bit of a turnoff. Anal retentive, I know, but it's the little things...
Emerald Coast - $395, if I'm understanding their pricing correctly, 8-10 hours plus a 4-hour audio thingy. Four-hour audio, followed by group seminar stuff and individual touch-up type stuff if needed. Not sure how long they've been doing prep. I've heard good things about them, mostly military guys, but seemed generic as well, and I don't really want to "lectured to" in a group environment. Yuck. Just for me personally.
Kit Darby - $395, two hours. After his history of raping pilots for years with his job fairs and exorbitant prices, not inclined to give him another penny. And I'm not traveling to the Atlanta airport to do a face-to-face only to be charged an additional $100 for the face-to-face.
Aerocrew Solutions - $399 in person, $99/hour over the phone. In person is three hours. Seems like the new kid on the block, so experience comes to mind...I think he's a Delta pilot - not sure how he can help with Frontier.
Centerline - $399, one-on-one, not sure how much time they spend. Skype-type stuff is available. These folks sent me a very pleasant and thoughtful email, but I'm having a hard time understanding how they can prep Frontier applicants specifically with no apparent connection to Frontier. They said "Anything you've ever wanted to know about the Frontier process, we have." I would assume based on trip reports from people who have reported back to them after interviewing. Seem like nice people, but also pretty new and are trying hard to establish themselves (no crime in that, but I would prefer those with some experience teaching idiots like me how to not be bigger idiots). They seem like they have their hearts in the right place, but I question their experience level.
Clark Aviation Consulting - $439, 10-12 hours over two sessions, one-on-one, in person or online meeting space, free followups anytime before the interview. I actually caught Lori in her short lunch break (sorry, Lori, if you're here) and liked what I heard in our short conversation. No hard sell, to the point, she's been doing it for 11+years, and HATES canned answers. Everything she said made a ton of sense, and was very humble. I jumpseated on Frontier out of Miami two days ago, and the First Officer had used her, with nothing but great things to say about her program. He specifically had underestimated the benefit of going through any sort of prep beforehand, and claimed that talking with Lori "changed his whole perspective on flying and interviewing." Who knows. A little melodramatic, maybe, but kinda cool at the same time. I guess her husband flies for Frontier, and when I asked her about that, she stated that, in no uncertain terms, simply working at a particular company doesn't make you more qualified to teach someone else how to get the job there. She downplayed the fact that he worked there, but I can't imagine that she doesn't have some insight regarding the history there as well as what the culture is like. My roommate just scheduled with Lori for his Alaska Airlines prep, and apparently she has a 100% success rate with over 50 people prepped with Alaska, so she has to be doing something right. I forgot to ask about her success rate with Frontier since she ran out of time - the 100% at Alaska came from my roommate.
So, for my particular situation, I chose....
Clark Aviation Consulting!
Looking forward to the prep, and really looking forward to my interview with Frontier! I hope this long-winded post helps people out there trying to decided. The stuff above is just my opinion - take it for what it's worth.