Braun ModellTechnik
(slow flyers and supplies)

Cloud 9 RC's Indoor Flying introduction
Lots of information about micro indoor planes and the RC equipment that makes them possible. Also has a nice list of vendors and other sites of interest.

FAI Model Supply
(distributor - Tan II rubber, indoor and outdoor FF kits, building materials and tools)

Herr Engineering Corporation
(balsa built-up indoor, FF and RC kits)

HomeFly.com
(slow flyer electric kits, batteries, supplies and electronics)

IndoorDuration.com
(Indoor News and Views)

Midwest Products
(they have a few FF kits...)

Peck Polymers
(source for indoor and free flight kits and supplies)

Plantraco
("The ultimate couch potato accessories"; RC blimps, "desktop rover" microvideo capable!, sub-ounce airplanes)

Sig Manufacturing Company

Skyhooks and Rigging
(indoor free flight and RC products, including slow-fly/ultralight gear)

SlowFlyers.com
(distributor)

SlowFlyers.com
(distributor)

ToyTronix
(home of the BallonCraft 2000 indoor helium flyer)

West Coast Blimps