Hi Kamil,

Sigma Aldrich is providing at least saturated fatty acid standards up to C30:0. Just check their fatty acid table in the link attached. 

http://www.sigmaaldrich.com/life-science/biochemicals/biochemical-products.html?TablePage=15823855

Also try:

Matreya LLC

Cayman Chemical

Nu-Check Prep

http://www.matreya.com

https://www.caymanchem.com

http://www.nu-chekprep.com/home.htm

I am also recommend Sigma.

Thanks to all. I know Sigma, but there are not all higher acids.

Thank you, Bruce, for last two links.

I am still missing C25, C27 and C29 fatty acids.

INDOFINE Chemical Company and Kinston Chemical have them.

http://indofinechemical.com/product-details.aspx?Sku=10-2900

http://indofinechemical.com/product-details.aspx?Sku=10-2700

http://indofinechemical.com/product-details.aspx?Sku=10-2500

http://www.kingstonchem.com/productshow/KST-14101724.html

Thank you, Bruce, again.