Where can I purchase the following common active ingredients to
sunscreen in quantities sufficient for experimenting with making my
own sunscreen without having to purchase them in enormous quantities?
I would like to be able to buy about a kilo or a couple of pounds
each.

The ingredients are:
Avobenzone (Parsol 1789)
Homosalate 
Octinoxate (Ethylhexyl Methoxycinnamate)
Octisalate (Ethylhexyl Salicylate)
Octocrylene 
Octyl Methoxycinnamate
Octyl Salicylate
Oxybenzone (Benzophenone-3)

OM-Cinnamate is available
here:http://www.makingcosmetics.com/store/index.html?lang=en-us&target=d3.html&lmd=38785.428403
I have been unable to find the others.

Thanks,
Jon

Spectrum chemicals and Sciencelab.com carry the products you requested

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http://www.sciencelab.com/data/company-info.htm



Spectrum Chemicals and Laboratory Products

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like dehydrated ethyl alcohol in research laboratory and bulk chemical
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http://www.spectrumchemical.com/retail/default.asp



Homosalate 
25 g  $52.63  
http://www.sciencelab.com/page/S/PVAR/SLH2899

25 GM $49.40 http://www.spectrumchemical.com/retail/product.asp?catalog%5Fname=Chemicals&product%5Fid=3220146




Octinoxate (Ethylhexyl Methoxycinnamate)
25 g  $24.00  
http://www.sciencelab.com/page/S/PVAR/SLO1324




Octisalate (Ethylhexyl Salicylate)
500 ml  $79.89  
http://www.sciencelab.com/page/S/PVAR/SLO1297

Octisalate, USP
100 ML  $28.45 http://www.spectrumchemical.com/retail/product.asp?catalog%5Fname=Chemicals&product%5Fid=3223438



Oxybenzone (Benzophenone-3)
500 g  $91.86  
http://www.sciencelab.com/page/S/PVAR/SLO1615

Oxybenzone  
100 GM   $31.65 http://www.spectrumchemical.com/retail/product.asp?catalog%5Fname=Chemicals&category%5Fname=&product%5Fid=3223704



Octyl p-Methoxycinnamate
100 GM $31.45 http://www.spectrumchemical.com/retail/product.asp?catalog%5Fname=Chemicals&category%5Fname=&product%5Fid=3223434

Octyl p-Methoxycinnamate, USP
25 GM    $17.30 http://www.spectrumchemical.com/retail/product.asp?catalog%5Fname=Chemicals&category%5Fname=&product%5Fid=3223433



Octyl Salicylate

Octisalate, USP
Octyl Salicylate; 2-Ethylhexyl salicylate
500 ml  $79.89  
http://www.sciencelab.com/page/S/PVAR/SLO1297

Octisalate, USP
Octyl Salicylate; 2-Ethylhexyl Salicylate
100 ML    $28.45 http://www.spectrumchemical.com/retail/product.asp?catalog%5Fname=Chemicals&product%5Fid=3223438


Octocrylene 
50 ML $49.80 http://www.spectrumchemical.com/retail/product.asp?catalog%5Fname=Chemicals&product%5Fid=3223417


I was only able to locate one source for Avobenzone
Parsol 1789 / Butyl Methoxydibenzoylmethane / Avobenzone
Givaudan Suisse SA 
Sold by Roche Affiliates Switzerland
Made in Switzerland 
Minimum order 20 kgs  
http://www.stobec.com/details.php3?p=7427&c=3
http://www.stobec.com/details.php3?p=7426&c=3


Search terms used: 
Fine chemicals retail 
Specialty chemicals retail


I hope the information provided is helpful!


Bets regards, 
Bobbie7

Great answer. I hadn't thought to search for the broad category of
suppliers rather than the specific chemicals I was looking for.
Thanks.