Can you please recommend any companies selling good quality Graphene Oxide, Graphite Oxide or Graphene (CVD/ Epitaxy)?

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Saeed Moghadam

check these two links, including a list of producers:

http://www.nanowerk.com/graphene_manufacturers_and_suppliers.php

http://www.graphene-info.com/companies

Sigma-Aldrich also has a range of graphene-based products suitable for different applications.

Christine Joy Uy Querebillo

NGS

Juan C Fierro-Gonzalez

Graphene Platform Corp

Tymoteusz Ciuk

If you are looking for highest-quality epitaxial graphene I recommend:

www.grapheneshop.pl

They offer CVD epitaxial graphene on SiC (monolayer and quasi-free-standing bilayer), CVD graphene on copper and transferred graphene (SiO2, Si, glass, polymer).