Dear Sir/Madam,
we are experienced Device Driver Developers in Windows, Linux and Mac OS X.
We can assist you in signing the 3rd party driver without further cost, as long as you consider us for further projecs with your company. Note: we will still need to purchase the official certificate on your name (this cost to be covered by your company).
Please visit our profile or [login to view URL] for references.
Thanks and regards.