What type are you looking for? Die-cast metal, wood display models, flying scale, etc? There are many good manufactures of die-cast....Armour/Franklin Mint, Corgi, Specast, and others. They have many scales for each line. A good place to shop or just look at them is e-bay under toys & hobbys, diecast, aircraft. There are may mail-order shops also.
http://www.collectables.biz/,
http://www.bobanddi-versions.com/,
http://www.onmarkint.com/,
http://www.badcataviation.com/index.html,
http://www.21stcenturytoys.com/,
http://www.aikensairplanes.com/dragonwings/drf70081.htm to name a few. There's even a forum....
http://www.diecastaircraftforum.com/archive/index.php/t-7515.html Most of these are 1/100, 1/72, 1/24.... If you prefer a larger scale look at some of the beautiful 1/18 scale aircraft by 21st Century/ Ultimate Warrior, their P-38 is a work of art and with an almost 3' wingspan. Some of these can be found at Toys-R-Us and E-bay. Suprisingly, if you watch E-bay and keep an eye on the shipping, you can sometimes get them cheaper than the stores! [/url]