I know I'll just be repeating myself from the other responses you got but I figured I'd just throw in some extra. More responses are better than none. Plus I'll be at the show too 
1) Is it reasonably safe to assume that anybody selling at one of these reptile shows would be safe to buy from? Or are some of the vendors just as bad as many pet stores?
---It is difficult to say what is a "good" or "bad" vendor. Not EVERYONE is safe to deal with, but that doesn't necessarily mean they're dishonest. Larger vendors have a lot of animals to take care of, so you shouldn't depend on what they tell you and THOROUGHLY check out the one animal that catches your eye. Advice given above, like checking its spine carefully for kinks and letting him roam around your hands for a little bit is a good idea to get a decent long look at him/her. Asking them to feed it in front of you is an excellent idea, I hadn't thought of that. Don't be afriad to ask questions. Any GOOD vendor will be willing to talk to you and understand you are investing in a life-long pet not a breeding project (There are a lot of arrogant breeders out there that won't give you the time of day cause your not buying their thousand dollar morphs that are sitting on the table, and those type of guys aren't worth your time). Make sure you ask how many times your baby has eaten, what type of pray it eats (size, live, frozen/thawed) and how often. Make sure it seems healthy and active. Make sure he doesn't seem to thin or look sickly or have parasites.
2) We live more than an hour away from the show. How do we safely transport our new baby home?
---I also live an hour away, and it truely isn't as bad on them as you think it would be. The snake will probably be given to you in a plastic container... ask if they have any extra snake bags to spare (alot of vendors will have extras behind the table). If not, bring a pillow case with you, or cover his container up with your sweatshirt something, or put him in a paper bag as recommended above for the drive. In darkness, they feel secure, it will eliminate stress. When you get him home and put him in his cage, I would recommend leaving him a lone for a couple days with no accessive handling. Let him get used to the environement. as it will help him wind down and eliminate stress he/she may be feeling.
3) How much do normal hatchlings go for at these shows? Will there be a price difference between males and females? Or does everyone just bring their fancy stuff and we might not even see any normals?
--- There should be pleanty of normals. A lot of vendors sell them in bulk to pet strores that come though the shows. One of my favorite little snakes was hand selected out of a big tupaware of a whole lot of two-week old babies. She was active and social and had had her first meal (as what I was looking for), and is now one of my best eaters. She was only $15 bucks. But baby normals should range with an minimum of $15.00 to a max of about $50.00. It will vary depending on the breeder and on the quatlity of the animal. Females are usually cost a few dollars more than males, but some place sell them for equal prices.
4) Anything else I've forgotten to ask that we should know about or look out for?
--- Since your looking for a pet, I'd recommend to take note of the persoanlity of your snake, instead of picking the one with the prettiest pattern off the bat. Being head shy is typical of a lot of baby balls, which truely isn't a big deal, but I would suggest to pick one that isn't too afraid of you and especially one that isn't nippy! Nervousness, fear, and biting can be worked out of any animal with time and being worked with patiently and often enough. However, picking a layed back, social animal that doesn't have a lot of fear from the beginning will be easier on you. You'll be able to enjoy him more, and I've personally found that my outgoing snakes typically don't stress as often.
Hope that helps!
Congratulations on you soon-to-be new pet!
Excellent choice, if I do say so myself 
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Cheers!
• Chelsea Lynn Gardiner
(and Frank M. Wood)