I don't know the website for the Kirkwood show I don't think it is the same as the Toy Man shows
The Toy Man shows generally have a few estate dealers selling models last time I went one guy brought over 500 models to sell.
http://www.toymanshow.com/
One of the local IPMS clubs is having a show in September
http://www.ipms-gateway.com/invite2011a.html
Some of the local flea markets Have dealers I know Truman Flea Market, Wentzville flea market, and Route 66 flea market have dealers there. They are expensive though so you have to either bargain really well of deal with paying high end or above ebay prices. Last time I was at Truman flea market the guy was selling snap 1/32 nascar kits for 10 bucks.One dealer had the Dealers choice trailer/racers wedge combo for 50 dollars when you can buy it on ebay for 25. I just laughed and walked away.
The belleville flea market has a dealer that comes every once in a while and his prices are decent but he's hit or miss. I sell some model stuff, parts and kits, for a local model group every other month their my prices are reasonable, lol, and I will be back there in March. If you want to come check out what I have.