You can also try:

http://www.thundertiger4u.com

http://www.infinitehobbies.com

http://www.kangkeusa.com

http://www.bj-model-engines.com/home.html

http://www.richmondrc.com

http://www.modelrectifier.com

http://www.bphobbies.com

http://www.allerc.com

http://www.enya-engine.com

The Enya engine website above is actually for the manufacturer's web site in Japan. They offer an English version, however, along with an online store. My average delivery time with standard shipping from them is 4 days from Tokyo to Omaha. Also, Enya engines are very kick ass, so you all should shop there.