Companies That Sell Science Educational Materials

A2Z Corp - https://www.a2zcorp.us/store/ - wonderful resource for model aviation supplies

AC Supply - http://www.acsupplyco.com/home.htm

Doc Fizzix - http://www.docfizzix.com/ - resource for mousetrap and rubber powered model cars. 

EverythingHobby - http://www.everythinghobby.com/ - my favorite hobby shop in Rochester Minnesota.

FAI Model Supply - http://www.faimodelsupply.com/ - wonderful resource for model aviation supplies

FESA Individual Projects - http://www.discoverycube.org/fsea.aspx?q=43

Home Science Tools - http://www.hometrainingtools.com/default.asp  -  large selection of science related items and kits.

Kelvin - http://www.kelvin.com

Midwest Products Co., Inc. - http://www.midwestproducts.com/index.asp

Pinewood Derby Supplies

Pinewood Professor - http://www.pinewoodprofessor.com/
Derby Magic - http://www.derbymagic.com/index.html
Maximum Velocity - http://www.maximum-velocity.com/
Derby Champ -http://www.derbychamp.com/
Pinewood Extreme - http://www.pinewoodextreme.com/
PinewoodDerbyTrack.com - http://www.pinewoodderbytrack.com/index.html

DerbyDominator - http://www.derbydominator.com/index.html
  

Pitsco - http://www.pitsco.com

Science City - http://www.science-city.com/index.html

Solar World - http://solarworld.com/JuniorSprint.htm - parts for Junior Solar Sprint cars

Squirrel Model Airplane - http://www.rubber-power.com/get-it.htm  - order Squirrel model airplane kits

Steve Spangler Science - http://www.stevespanglerscience.com

Uptown Sales - http://www.hobbyplace.com/index.html - large selection of science related items and kits.