I was wondering if anyone knows if there any companies who sell small
quantities of chemicals for laboratory use.  Specifically, I'm looking
for half liters of benzyl and cinnamyl alcohol.  Most companies that
I've found on the Internet only sell in bulk.  Thanks!

Dear dijkstra,

As it seems, there are not many retail distributors for chemicals.
However, I managed to find some that might fulfill your needs:

The Chemistry Store
http://www.chemistrystore.com/
520 NE 26th Court 
Pompano Beach
FL 33064
Phone (toll free): 1-800-224-1430
Phone: (954) 942-7813
E-Mail: sales@chemistrystore.com
They offer various chemicals in quantities up from 1 quart (approx. 1
litre) and less. The minimum order value is $ 10.00.

The Science Alliance
http://www.sciencealliance.com/
1920 Treble Drive, Suite J1
Humble
TX 77338
Phone: 281-540-3115
Fax: 281-540-3117
E-Mail: info@sciencealliance.com
Another distributor of chemicals in small quantities, also with a
minimum order value of $ 10.00.

Advance Scientific & Chemical, Inc.
http://www.advance-scientific.com/
2345 SW 34th Street
Fort Lauderdale
FL 33312
Phone (toll free): 1-800-524-2436
Phone: (954) 327-0900
Fax: (954) 327-0903
E-Mail: info@advance-scientific.com
Distributes chemicals in laboratory (e.g. small) quantities. NOTE:
They offer half-litres of Benzyl Alcohol, at the price of § 45.00.
While Cinnamyl Alcohol is not part of their product list, they state
explicitly to have an open ear for special inquiries.

Search terms used:
chemicals "retail distributors":
://www.google.de/search?hl=de&ie=UTF-8&oe=UTF8&newwindow=1&q=chemicals+%22retail+distributors%22&meta=
"chemical distributors" "small quantities":
://www.google.de/search?hl=de&ie=UTF-8&oe=UTF8&newwindow=1&q=%22chemical+distributors%22+%22small+quantities%22&meta=
DMOZ search: http://dmoz.org/Business/Industries/Manufacturing/Chemicals/Suppliers/

I hope this will help you getting the chemicals you need!
Regards,
Scriptor