The Dallas area has pretty much lost all of it's good hobby shops. However, I don't remember more that one or two of those old shops that specialized in o gauge, or Lionel in general.
We have 3 train shows here during the year, but 2 are in late Sept./early Oct., and one is in Jan., so the rest of the year, you are out of luck for show shopping.
With the arrival of a new grandson 4 years ago, the trains came out of the closet, and I renewed my interest in Postwar Lionel. I just get the bug now and then for one of the older Lionel items, and there is nowhere to shop, except Ebay, so it seems. I have bought off Ebay. A lot items, even from highly rated sellers, are just not quite as advertised, and have some nagging issue when they arrive. ( I really am not all that picky either).
I just thought I might be missing some dealer with a website full of postwar for sale and an up to date listing of it.
Jeff