OK, in no particular order...
That show is one that has its own website, and on that website is a list of vendors (including breeders). BTW, I just took a peek, and it's a far better organized list than any I've seen/worked with before. It's going to take a little effort/homework, but you can make a list of those vendors, sift out the breeders, look each one up, and evaluate. This is what we did prior to getting our first BD--4 times (4 shows). It was worth the effort--we got to meet & chat with a LOT of people, and were confident in the breeder we chose and our new charge.
Interesting... some of the vendors at the shows we attended (in the Northeast) came from the Midwest, but I didn't recognize any of them on this show's vendors list. Don't attach any meaning to that; the market here is quite seasonal, and most of the local breeders have shut down for the winter.
I have no opinion as to youngest age; I trusted the breeder on that--Zardoz was 5 weeks at that show, and he's doing fine now at 8 weeks. As to price, I don't think it's worth nickel-dimeing. IMO, a reputable breeder, captive bred & born, and healthy animals are more important than saving $5 or $10 ...and worth it. What I have noticed is that prices are quite a bit lower at shows due to the higher immediate competition, and breeders not wanting to transport all those baby animals back home. If you see a dragon you really like, you've done all your homework, and the price is affordable, buy it.
YMMV